Library of Congress >> MARC >> Authority >> 7XX >> 780

780 - Subdivision Linking Entry-General Subdivision (R)

MARC 21 Authority - Full
October 2002

First Indicator
# - Undefined

Second Indicator
0 - Library of Congress Subject Headings
1 - LC subject headings for children's literature
2 - Medical Subject Headings
3 - National Agricultural Library subject authority file
4 - Source not specified
5 - Canadian Subject Headings
6 - Répertoire de vedettes-matière
7 - Source specified in subfield $2

Subfield Codes
$v - Form subdivision (R)
$w - Control subfield (NR)
    /0 - Link display
    /1 - Replacement complexity
$x - General subdivision (R)
$y - Chronological subdivision (R)
$z - Geographic subdivision (R)
$0 - Record control number (R)
$2 - Source of heading or term (NR)
$5 - Institution to which field applies (R)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)


General subdivision term that is equivalent to the 150 topical term or 180 general subdivision field of the same record. It links headings within a system or from different thesauri or authority files.


Most of the content designators defined for field 780 are the same as those defined for field 180 (Heading-General Subdivision), field 480 (See From Tracing-General Subdivision), and field 580 (See Also From Tracing-General Subdivision). Description, guidelines, and input conventions for shared content designators are given in the X80 General Subdivisions-General Information section.

Guidelines for applying the second indicator, subfield $w (Control subfield), and $2 (Source of heading or term) in field 780 are given in the 7XX Heading Linking Entries-General Information section.


Equivalent terms used within a thesaurus in established heading and subdivision records:

008/09 a
[established heading record]
008/11 a
[code indicating LCSH]
150 ##$aUniforms
780 #0$xUniforms$0 [record control number]
008/09 d
[subdivision record]
008/11 a
[code indicating LCSH]
180 ##$xUniforms
750 #0$aUniforms$0 [record control number]

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

008/09 a
[established heading record]
008/11 a
[code indicating LCSH]
150 ##$aHistory
780 #0$wa$xHistory

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