Marc authority Format Heading Linking Entry Fields (7XX)




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MARC Authority Format

Heading Linking Entry Fields (7XX)
Fields 700-788 contain information that provides a machine link within a system between equivalent headings whether they are structured in the same or different form, are from the same or different authority files or printed thesauri, or whether they exist as separate authority records.
HEADING LINKING ENTRIES: GENERAL INFORMATION

700 - ESTABLISHED HEADING LINKING ENTRY: PERSONAL NAME

710 - ESTABLISHED HEADING LINKING ENTRY: CORPORATE NAME

711 - ESTABLISHED HEADING LINKING ENTRY: MEETING NAME

730 - ESTABLISHED HEADING LINKING ENTRY: UNIFORM TITLE

750 - ESTABLISHED HEADING LINKING ENTRY: TOPICAL TERM

751 - ESTABLISHED HEADING LINKING ENTRY: GEOGRAPHIC NAME

755 - ESTABLISHED HEADING LINKING ENTRY: GENRE/FORM TERM

780 - SUBDIVISION HEADING LINKING ENTRY: GENERAL SUBDIVISION

781 - SUBDIVISION HEADING LINKING ENTRY: GEOGRAPHIC SUBDIVISION

782 - SUBDIVISION HEADING LINKING ENTRY: CHRONOLOGICAL SUBDIVISION

785 - SUBDIVISION HEADING LINKING ENTRY: FORM SUBDIVISION

788 - COMPLEX LINKING ENTRY DATA

HEADING LINKING ENTRIES: GENERAL INFORMATION
The inclusion of a linking entry field in an established heading or established heading and subdivision record for a name, name/title, uniform title, topical term, form term, or extended subject heading or in an established heading record for an authorized subject subdivision may be used to relate headings.
First indicator

The definition of the first indicator for each 7XX field is the same as in the corresponding 1XX field. A description can be found with the corresponding 1XX field.


Second indicator

Subject heading system/Thesaurus

Specifies the subject heading system or thesaurus used in constructing the heading.

0 Library of Congress Subject Headings/LC authority files The subject added entry conforms to and is appropriate for use in the Library of Congress Subject Headings (LCSH) and the LC authority files.


1 LC subject headings for children's literature

The subject added entry conforms to the "AC Subject Headings" section of the LCSH and is appropriate for use in the LC Annotated Card Program.


2 Medical Subject Headings/NLM authority files

The subject added entry conforms to the NLM authority files.


3 National Agricultural Library subject authority file

The subject added entry conforms to the NAL subject authority file.


4 Source not specified

The subject added entry conforms to a controlled list that cannot be identified by another defined value or by a code in subfield 2.


5 Canadian Subject Headings/NLC authority file

The subject added entry conforms to and is appropriate for use in the Canadian Subject Headings and the NLC authority files.


6 Rpertoire des vedettes-matire/NLC authority file

The subject added entry conforms to and is appropriate for use in the Repertoire des vedettes-matiere and the NLC authority files.


7 Source specified in subfield 2

The subject added entry conforms to the subject heading/thesaurus building conventions identified by the code contained in subfield 2.


HEADING LINKING ENTRIES: GENERAL INFORMATION p. 2
Special subfield codes:

Subfields defined for the 7XX fields are generally the same as those for the corresponding 1XX fields, where some descriptions can be found. Descriptions of subfield w, subfield 0, subfield 2, and subfield 8 as defined for the 7XX fields are given in this section.

‚w Control subfield

Only one character position (designated by /0) that controls the generation of a link display

from a 7XX field. Subfield w need be used only if the display is to be suppressed.

0 Link display

A one character alphabetic code that controls the suppression of a link display from a 7XX field.

a Link not displayed

Used for local system-dependent reason for suppression that is not covered by code b or c. For interchange purposes, code a is converted to n or a fill character ( | ).

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

Used when there is no restriction on displaying a link from the 7XX field. If code n

is applicable, subfield w need not be used.


‚0 Record control number

Contains the system control number of the related authority record preceded by the MARC

code, enclosed in parentheses, for the system to which the control number applies. The

source of the code is the USMARC Code List for Organizations.


‚2 Source of heading or term

Contains a code that identifies the source of the heading when the second indicator position

contains value 7. The source of the code is the USMARC Code List for Relators, Sources,

Description Conventions that is maintained by the Library of Congress.


‚8 Linking number

Contains a number that links a 7XX (Heading Linking) field to one or more other 7XX fields

when it and the other field(s) together form an equivalent for the heading in the 1XX field.

The linking number is a variable length whole number. The same number is used in each of

the related 7XX linking fields.

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700 ESTABLISHED HEADING LINKING ENTRY: PERSONAL NAME Repeatable
Contains a personal name heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for 100 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

Type of personal name entry element

0 Forename

1 Surname

3 Family name
Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

M ‚a Personal name

‚b Numeration

R ‚c Titles and other words associated with a name

‚d Dates associated with a name

R ‚e Relator term

‚f Date of a work

‚g Miscellaneous information

‚h Medium

R ‚k Form subheading

‚l Language of a work

R ‚m Medium of performance for music

R ‚n Number of part/section of a work

‚o Arranged statement for music

R ‚p Name of part/section of a work

‚q Fuller form of name

‚r Key for music

‚s Version

‚t Title of a work

R ‚v Form subdivision



700 ESTABLISHED HEADING LINKING ENTRY: PERSONAL NAME p. 2
‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number


Examples:
100 0b ‚a Francis, ‚c of Assisi, Saint, ‚d 1182-1226

700 05 ‚w a ‚a Francis, of Assisi, ‚c Saint, ‚d 1182-1226 [NLC English heading]

700 06 ‚w a ‚a Francois, d'Assise, ‚c saint, ‚d 1182-1226 [NLC French heading]

700 07 ‚w a ‚a Francis, of Assisi, ‚c Saint, ‚d 1182-1226 ‚2 [source code] [British Library heading]


100 1b ‚a Dostoyevsky, Fyodor, ‚d 1821-1881. ‚t Prestuplenie i nakazenie. ‚l English

700 11 ‚w a ‚a Dostoyevsky, Fyodor, ‚d 1821-1881. ‚t Crime and punishment [LC subject heading for children's literature]

May 11, 1999

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710 ESTABLISHED HEADING LINKING ENTRY CORPORATE NAME Repeatable
Contains a corporate name heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 110 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

Type of corporate name entry element

0 Inverted name

1 Jurisdiction name

2 Name in direct order

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

M ‚a Corporate name or jurisdiction name as entry element

R ‚b Subordinate unit

‚c Location of meeting

R ‚d Date of meeting or treaty signing

R ‚e Relator term

‚f Date of a work

‚g Miscellaneous information

‚h Medium

R ‚k Form subheading

‚l Language of a work

R ‚m Medium of performance for music

R ‚n Number of part/section/meeting

‚o Arranged statement for music

R ‚p Name of part/section of a work

‚r Key for music

‚s Version

‚t Title of a work

R ‚v Form subdivision

710 ESTABLISHED HEADING LINKING ENTRY CORPORATE NAME p. 2
‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number


Examples:
110 2b ‚a Last Poets (Group)

710 27 ‚w a ‚a Last Poets ‚2 [source code]


110 2b ‚a Royal Society of Medicine (Great Britain)

710 27 ‚w a ‚a Royal Society of Medicine ‚2 [source code] [British Library heading]

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711 ESTABLISHED HEADING LINKING ENTRY: MEETING NAME Repeatable
Contains a meeting name heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 111 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

Type of meeting name entry element

0 Inverted name

1 Jurisdiction name

2 Name in direct order
Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

M ‚a Meeting name or jurisdiction name as entry element

‚c Location of meeting

‚d Date of meeting

R ‚e Subordinate unit

‚f Date of a work

‚g Miscellaneous information

‚h Medium

R ‚k Form subheading

‚l Language of a work

R ‚n Number of part/section/meeting

R ‚p Name of part/section of a work

‚q Name of meeting following jurisdiction name entry element

‚s Version

‚t Title of a work

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable



711 ESTABLISHED HEADING LINKING ENTRY: MEETING NAME p. 2
R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number

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730 ESTABLISHED HEADING LINKING ENTRY: UNIFORM TITLE Repeatable
Contains a uniform title heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 130 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire/NLC authority file

7 Source specified in subfield 2


Subfield codes:

M ‚a Uniform title

R ‚d Date of treaty signing

‚f Date of a work

‚g Miscellaneous information

‚h Medium

R ‚k Form subheading

‚l Language of a work

R ‚m Medium of performance for music

R ‚n Number of part/section of a work

‚o Arranged statement for music

R ‚p Name of part/section of a work

‚r Key for music

‚s Version

‚t Title of a work

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number



730 ESTABLISHED HEADING LINKING ENTRY: UNIFORM TITLE p. 2
‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number



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May 11, 1999



750 ESTABLISHED HEADING LINKING ENTRY:TOPICAL TERM Repeatable
Contains a topical term heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 150 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

M ‚a Topical term or geographic name as entry element

‚b Topical term following geographic name as entry element

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number


750 ESTABLISHED HEADING LINKING ENTRY:TOPICAL TERM p. 2
Examples:
150 bb ‚a Genetic engineering [LCSH heading]

750 b2 ‚a Genetic Engineering [NLM heading]


150 bb ‚a Hydroponique [French Canadian subject]

750 b5 ‚a Hydroponics [English Canadian subject]


150 bb ‚a Radiography in orthopedics [LCSH heading

750 b2 ‚8 1 ‚w b ‚a Orthopedics [MeSH heading]

750 b2 ‚8 1 ‚w b ‚a Radiography [MeSH heading]
150 bb ‚a Cancer ‚x Nursing [LCSH heading]

450 bb ‚a Oncologic nursing

750 b2 ‚a Neoplasms ‚x Nursing [MeSH heading]

750 b2 ‚a Oncologic Nursing [MeSH heading]


150 bb ‚a Drill and minor tactics [LCSH heading]

750 b7 ‚a Military training ‚2 lctgm [LC Thesaurus for Graphic Materials heading]


Topical term used in LCSH both as an established heading and as a general subdivision:

008/09 d [subdivision record]

180 bb ‚x Uniforms

750 b0 ‚a Uniforms ‚0 [record control number]


008/09 a [established heading record]

150 bb ‚a Uniforms

780 b0 ‚x Uniforms ‚0 [record control number]

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751 ESTABLISHED HEADING LINKING ENTRY: GEOGRAPHIC NAME Repeatable
Contains a geographic name heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 151 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

M ‚a Geographic name

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number
751 ESTABLISHED HEADING LINKING ENTRY: GEOGRAPHIC NAME p. 2
Examples:
151 bb ‚a New York (N.Y.) [LCSH heading]

751 b2 ‚a New York City [MeSH heading]


Geographic name used in LCSH both as an established heading and as a geographic subdivision:

008/09 d [subdivision record]

181 bb ‚z France ‚z Corsica

751 b0 ‚a Corsica (France) ‚0 [record control number]


008/09 a [established heading record]

151 bb ‚a Corsica (France)

781 b0 ‚z France ‚z Corsica ‚0 [record control number]

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755 ESTABLISHED HEADING LINKING ENTRY: GENRE/FORM TERM Repeatable
Contains a genre/form term heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 155 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

M ‚a Genre/form term as entry element

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number
Examples:
155 bb ‚a Periodicals ‚v Indexes [LCSH heading]

755 b6 ‚a Periodiques ‚v Indexes [French Canadian heading]


Topical term used both as an established heading and as a general subdivision:

185 bb ‚v atlases [AAT subdivision record]

755 b7 ‚a atlases ‚0 [record control number] ‚2 aat
155 bb ‚a atlases [AAT established heading record]

785 b7 ‚v atlases ‚0 [record control number] ‚2 aat

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780 SUBDIVISION HEADING LINKING ENTRY: GENERAL SUBDIVISION Repeatable
Contains a general subdivision heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 180 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number


780 SUBDIVISION HEADING LINKING ENTRY: GENERAL SUBDIVISION p. 2
Examples:
150 bb ‚a Corrosion and anti-corrosives [LCSH heading]

360 bb ‚i subdivision ‚a Corrosion ‚i under types of materials or equipment, e.g.

‚a Aluminum--Corrosion; Concrete--Corrosion; Steam-boilers--Corrosion

780 b0 ‚w c ‚x Corrosion


Established heading topical term is also used as a general subdivision; no separate subdivision record:

150 bb ‚a History

780 b0 ‚w a ‚x History

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781 SUBDIVISION HEADING LINKING ENTRY: GEOGRAPHIC SUBDIVISION

Repeatable


Contains a geographic subdivision heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 181 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number


Examples:
Equivalent form of a geographic name used as a subdivision; no separate subdivision record:

151 bb ‚a Rome (N.Y.)

781 b0 ‚z New York (State) ‚z Rome
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782 SUBDIVISION HEADING LINKING ENTRY: CHRONOLOGICAL SUBDIVISION Repeatable
Contains a chronological subdivision heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 182 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number


Example:
Equivalent form of a topical term used as a subdivision; no separate subdivision record:

150 bb ‚a Twentieth century

782 b0 ‚wa ‚y20th century
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785 SUBDIVISION HEADING LINKING ENTRY: FORM SUBDIVISION Repeatable
Contains a form subdivision heading that is equivalent to the heading contained in the 1XX field or the same record. It links headings within a system or from different thesauri or authority files.

Content designators defined for this field are generally the same as those for the 185 field. Descriptions of the second indicator and subfields w, 0, 2, and 8 are given in the Heading Linking Entries: General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield 2


Subfield codes:

R ‚v Form subdivision

‚w Control subfield

0 Link display

a Link not displayed

b Link not displayed, field 788 used

c Link not displayed, non-7XX field used

n Not applicable

R ‚x General subdivision

R ‚y Chronological subdivision

R ‚z Geographic subdivision

R ‚0 Record control number

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage

‚8 Linking number


Examples:

155 bb ‚a atlases [AAT established heading record]

785 b7 ‚v atlases ‚0 [record control number] ‚2 aat
Established heading genre/form term is also used as a form subdivision; no separate subdivision record:

155 bb ‚a Periodicals

785 b0 ‚w a ‚v Periodicals

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788 COMPLEX LINKING ENTRY DATA
Contains the explanatory text and the headings referred to when the linking relationship between headings from different subject heading systems or thesauri cannot be adequately conveyed by fields 700-785. No sub-elements of the heading referred to are separately subfield coded. Adjacent headings referred to may be contained in a single subfield a. The heading referred to may be an established heading or a subject subdivision that is not equivalent to but is related to the heading in the 1XX field.

Descriptions of the second indicator and subfield 2 are given in the Heading Linking Entries: General Information section.


First indicator:

b Undefined

Second indicator:

Subject heading system/thesaurus

0 Library of Congress Subject Headings/LC authority files

1 LC subject headings for children's literature

2 Medical Subject Headings/NLM authority files

3 National Agricultural Library subject authority file

4 Source not specified

5 Canadian Subject Headings/NLC authority file

6 Rpertoire des vedettes-matire /NLC authority file

7 Source specified in subfield ‚2


Subfield codes:

R ‚a Heading referred to

R ‚i Explanatory text

‚2 Source of heading or term

‚5 Institution to which field applies

‚6 Linkage


Examples:

788 b0 ‚i subdivision ‚a Foreign bodies ‚i under names of organs, e.g. ‚a Eye--Foreign bodies

788 b7 ‚i [text to be supplied] ‚2 aat

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