751 Index Term - Geographic Name

Field definition and scope:

Field 751 contains a geographic name used as an index term that supplements terms derived in the MARC record. The geographic name may be referred to in the classification number and caption in field 153 (Classification Number).

The field may be used to link a classification number with a related controlled geographic name heading. The values in the second indicator position or the data in subfield $2 (Source of heading or term) identify the subject heading system or thesaurus used by an institution to formulate the geographic name index term. Terms not controlled by a thesaurus or authority file are contained in field 753 (Index Term - Uncontrolled).

Field 751 is repeatable.

Guidelines for applying content designators:

Field 751 parallels the 651 Subject Added Entry field in the bibliographic format. The indicators and subfield codes below were created from the information in field 651. Examples of field 751 are provided in this section. Guidelines for the input conventions and the source for the content designators are in MARC 21 Format for Bibliographic Data: 651 (Subject Added Entry - Geographic Name).

For indicator and subfield code definitions and examples, and designator repeatability, see table below:

Position	Description	Repeatability
Field 751	Index Term - Geographic Name	R
Indicator:
First	Undefined; contains a blank

Second	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 des vedettes-matière
7	Source specified in subfield $2

Subfield code:
$a	Geographic name	NR
$i	Explanatory text	R
$v	Form subdivision	R
$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
$3	Materials specified	NR
$6	Linkage	NR
$8	Field link and sequence number	R

See: Examples for this field.

Content designator history:

Subfield $0 - Record control number [redefined, 2010]

Subfield $1 - Real World Object URI [new, 2017]