MARC 21 Format for Authority Data: 780: Subdivision Linking Entry-General Subdivision (Network Development and MARC Standards Office, Library of Congress)

780 - Subdivision Linking Entry-General Subdivision (R)

MARC 21 Authority - full

December 2017

First Indicator	Second Indicator
Undefined # - Undefined	Thesaurus 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

First Indicator

Second Indicator

Undefined
# - Undefined

Thesaurus
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
$i - Relationship information (R) $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 - Authority record control number or standard number (R)	$1 - Real World Object URI (R) $2 - Source of heading or term (NR) $4 - Relationship (R) $5 - Institution to which field applies (R) $6 - Linkage (NR) $8 - Field link and sequence number (R)

Subfield Codes

$i - Relationship information (R)
$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 - Authority record control number or standard number (R)

$1 - Real World Object URI (R)
$2 - Source of heading or term (NR)
$4 - Relationship (R)
$5 - Institution to which field applies (R)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

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.

GUIDELINES FOR APPLYING CONTENT DESIGNATORS

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), $2 (Source of heading or term), subfield $i (Relationship information), and subfield $4 (Relationship) in field 780 are given in the 7XX Heading Linking Entries-General Information section.

■ EXAMPLES

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

(12/18/2017)