First indicator:

#  Undefined

Second indicator - 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


a  Geographic name (NR)

e  Relator term (R)

g  Miscellaneous information (R)

v  Form subdivision (R)

x  General subdivision (R)

y  Chronological subdivision (R)

z  Geographical subdivision (R)

0  Authority record control number or standard number (R)

2  Source of heading or term (NR)

3  Materials specified (NR)

4  Relator code (R)

6  Linkage (NR)

8  Field link and sequence number (R)

NOTE:  See MARC 21 Format for Bibliographic Data (651 Subject Added Entry - Geographic Name) for code definitions not given below.


Field 651 contains:

1.   Political jurisdictions—alone or subdivided by subject terms.

EXCEPTIONS:  Political jurisdictions subdivided by names of organized bodies are considered corporate names (field 610); Political jurisdictions with a title are also considered corporate names (field 610).

651 #0 Canada.

651 #0 Canada $v Bibliography.

610 10 Canada. $b Agriculture Canada $x Officials and employees.

610 10 France. $t Bulletin officiel du registre du commerce et du registre des métiers.

2.   Natural features, e.g., bays, capes, rivers, mountains, deserts, etc.

3.   Geographical regions and celestial bodies, e.g., names of continents, land masses, planets, stars, etc.

4.   Archaeological sites.

5.   Parks, neighborhoods, etc.

651 #0 Central Park (New York, N.Y.) $x History.

651 #6 Trail, C.-B. $x Répertoires.

651 #0 Charlestown (Boston, Mass.) $v Newspapers.

6.   Local place names, e.g., names of cities, towns, etc.

NOTE:  The place given in this field may or may not be the same as that given in field 752 (place of publication) which is used in records for newspapers.

651 #0 Asheboro (N.C.) $v Newspapers.

651 #0 Burrillville (R.I. : Town) $v Newspapers.

Second indicator

The second indicator describes the source of the heading.  For instructions see Subject Headings - General Information.


For a description of subfields $v, $x, $y, $z, and $2, see Subject Headings - General Information.

Related fields, etc.

752, Subject Headings - General Information, Appendix I

651 Subject Added Entry - Geographic Name  (MARC 21 Format for Bibliographic Data)

See also:

6XX  Subject Access Fields

Variable Data Fields

Section E.  MARC 21 Format for Serials as Applied Within CONSER

CONSER Editing Guide:  Contents