MARC 21 Format for Authority Data: 751: Established Heading Linking Entry-Geographic Name (Network Development and MARC Standards Office, Library of Congress)

751 - Established Heading Linking Entry-Geographic Name (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
$a - Geographic name (NR) $g - Miscellaneous information (R) $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

$a - Geographic name (NR)
$g - Miscellaneous information (R)
$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 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 751 are the same as those defined for field 151 (Heading-Geographic Name), field 451 (See From Tracing-Geographic Name), and field 551 (See Also From Tracing-Geographic Name). Description, guidelines, and input conventions for shared content designators are given in the X51 Geographic Names-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 751 are given in the 7XX Heading Linking Entries-General Information section.

■ EXAMPLES

Equivalent geographic names from different thesauri:

008/09	a [established heading record]
008/10	c [code indicating a name heading]
008/11	a [code indicating LCSH]
151	##$aNew York (N.Y.)
751	#2$aNew York City [Heading from MeSH]

008/09	a [established heading record]
008/10	c [code indicating a name heading]
008/11	c [code indicating MeSH]
151	##$aNew York City
751	#0$aNew York (N.Y.) [Heading from LCSH]

(12/18/2017)