Library of Congress >> MARC >> Authority >> 7XX  >> 750

750 - Established Heading Linking Entry-Topical Term (R)


MARC 21 Authority - full
October 2014

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 - Topical term or geographic name entry element (NR)
  • $b - Topical term following geographic name entry element (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)
  • $2 - Source of heading or term (NR)
  • $4 - Relationship code (R)
  • $5 - Institution to which field applies (R)
  • $6 - Linkage (NR)
  • $8 - Field link and sequence number (R)

FIELD DEFINITION AND SCOPE

Topical term that is equivalent to the 150 topical term or 180 general 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 750 are the same as those defined for field 150 (Heading-Topical Term), field 450 (See From Tracing-Topical Term), and field 550 (See Also From Tracing-Topical Term). Description, guidelines, and input conventions for shared content designators are given in the X50 Topical 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 code) in field 750 are given in the 7XX Heading Linking Entries-General Information section.

EXAMPLES

Equivalent topical terms from different thesauri:

008/09 a
[established heading record]
008/11 c
[code indicating MeSH]
150 ##$aNeoplasms$xNursing
750 #0$aCancer$xNursing
[Heading from LCSH]
008/09 a
[established heading record]
008/11 c
[code indicating MeSH]
150 ##$aOncologic Nursing
750 #0$aCancer$xNursing
[Heading from LCSH]
008/09 a
[established heading record]
008/11 a
[code indicating LCSH]
150 ##$aCancer$xNursing
450 ##$aOncologic nursing
750 #2$aNeoplasms$xNursing
750 #2$aOncologic Nursing
[Headings from MeSH]

Equivalent topical terms from different thesauri:

008/09 a
[established heading record]
008/11 a
[code indicating LCSH]
150 ##$aDrill and minor tactics
750 #7$aMilitary training$2lctgm
[Heading from LC Thesaurus for Graphic materials]
008/09 a
[established heading record]
008/11 z
[code indicating other]
040 ##$aDLC$cDLC$flctgm
150 ##$aMilitary training
750 #0$aDrill and minor tactics
[Heading from LCSH]

Topical term used within a thesaurus both as an established heading and as a general subdivision:

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

Library of Congress >> MARC >> Authority >> 7XX  >> 750
(10/20/2014)
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