MARC 21 Format for Authority Data: 781: Subdivision Linking Entry-Geographic Subdivision (Network Development and MARC Standards Office, Library of Congress)

781 - Subdivision Linking Entry-Geographic 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

Geographic subdivision name that is equivalent to the 151 geographic name or 181 geographic 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 781 are the same as those defined for field 181 (Heading-Geographic Subdivision), field 481 (See From Tracing-Geographic Subdivision), and field 581 (See Also From Tracing-Geographic Subdivision). Description, guidelines, and input conventions for shared content designators are given in the X81 Geographic Subdivisions-General Information section.

Guidelines for applying the second indicator, subfield $w (Control subfield), subfield $2 (Source of heading or term), subfield $i (Relationship information), and subfield $4 (Relationship) in field 781 are given in the 7XX Heading Linking Entries-General Information section.

■ EXAMPLES

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

008/09	a [established heading record]
008/11	a [code indicating LCSH]
151	##$aUkraine, Southern
781	#0$zUkraine, Southern

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

008/09	a [established heading record]
008/11	a [code indicating LCSH]
151	##$aRome (N.Y.)
781	#0$zNew York (State)$zRome

(12/18/2017)