MARC 21 Format for Authority Data: 755: Established Heading Linking Entry-Genre/Form Term (Network Development and MARC Standards Office, Library of Congress)

755 - Established Heading Linking Entry-Genre/Form Term (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 - Genre/form term as entry element (NR) $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 - Genre/form term as entry element (NR)
$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

Genre/form term that is equivalent to the 155 genre/form term or 185 form subdivision heading 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 755 are the same as those defined for field 155 (Heading-Genre/Form Term), field 455 (See From Tracing-Genre/Form Term), and field 555 (See Also From Tracing-Genre/Form Term). Description, guidelines, and input conventions for shared content designators are given in the X55 Genre/Form Terms-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 755 are given in the 7XX Heading Linking Entries-General Information section.

■ EXAMPLES

Equivalent genre/form terms from different thesauri:

008/09	a [established heading record]
008/11	a [code indicating LCSH]
155	##$aPeriodicals$vIndexes
755	#6$aPériodiques$vIndex [Heading from RVM]

008/09	a [established heading record]
008/11	v [code indicating Répertoire de vedettes-matière]
155	##$aPériodiques$vIndex
755	#0$aPeriodicals$vIndexes [Heading from LCSH]

Topical terms used within a thesaurus both as an established heading and as a form subdivision:

008/09	d [subdivision record]
008/11	r [code indicating AAT]
185	##$vatlases
755	#7$aatlases$0 [record control number] $2aat

008/09	a [established heading record]
008/11	r [code indicating AAT]
155	##$aatlases
785	#7$vatlases$0 [record control number] $2aat

(12/18/2017)