Contents Fixed field Access points 0xx 1xx 2xx 3xx 4xx 5xx 6xx 7xx 8xx 9xx Control subfields

690 Local Subject Added Entry--Topical Term (R)

Record Type
BIB, LBD
Input Standards
Field (Full/Minimal)
Optional/Optional
1st Indicator Level of subject
	No information provided
0	No level specified
1	Primary
2	Secondary
2nd Indicator Thesaurus
	No information provided
0	Library of Congress subject heading
1	LC subject heading for children's literature
2	Medical subject heading
3	National Agricultural Library subject authority file
4	Source not specified
5	Canadian subject heading
6	Répertoire de vedettes-matière
7	Source is specified in subfield ǂ2
Subfields (R=Repeatable NR=Nonrepeatable)		Input Standards (Full/Minimal)
ǂa	Topical term or geographic name as entry element (NR)	Mandatory/Mandatory
ǂb	Topical term following geographic name as entry element (NR)	Required if applicable/Required if applicable
ǂc	Location of event (NR)	Optional/Optional
ǂd	Active dates (NR)	Optional/Optional
ǂe	Relator term (NR)	Optional/Optional
ǂg	Miscellaneous information (R)	Required if applicable/Required if applicable
ǂv	Form subdivision (R)	Required if applicable/Required if applicable
ǂx	General subdivision (R)	Required if applicable/Required if applicable
ǂy	Chronological subdivision (R)	Required if applicable/Required if applicable
ǂz	Geographic subdivision (R)	Required if applicable/Required if applicable
ǂ1	Real World Object URI (R)	Optional/Optional
ǂ2	Source of heading or term (NR)	Required if applicable/Required if applicable
ǂ3	Materials specified (NR)	Optional/Optional
ǂ6	Linkage (NR)	System supplied/System supplied
ǂ8	Field link and sequence number (R)	Optional/Optional
ǂ9	Special entry (NR)	Optional/Optional

Definition

A locally devised topical subject used as a subject added entry. Use field 690 only for topical subject entries not based on LC, AC, NLM, NAL, NLC or Sears or for topical subject entries based on nonstandard applications of these authorities. Use field 650 if the topical subject entry is based on LC, AC, NLM, NAL, NLC or Sears. A topical subject added entry consists of a general subject term including the name of an event or object. See field 650 for more information.

WorldCat record retention

Field 690 is not retained in the WorldCat record. However, it is retained in exported records and records delivered via other services.

1st Indicator

Level of subject. The level of the subject entry. Use the 1st indicator to distinguish primary and secondary descriptors.

No information provided. No information as to the level of the subject term is provided.

690

0

Architecture, Modern ǂy 19th century.

0

No level specified. The level of the subject term could be determined, but is not specified.

690

0

Flour and feed trade ǂv Periodicals.

1

Primary. A subject covers the main focus or subject content of the material.

690

1

2

Cardiovascular Physiology ǂv Congresses.

690

1

7

Career Exploration. ǂ2 ericd

690

1

7

Cooks. ǂ2 ericd

2

Secondary. A subject covers a less important aspect of the content of the material.

690

2

Carbon Monoxide ǂx metabolism ǂv Congresses.

690	2	7	Food Service. ǂ2 ericd
690	2	7	Junior High Schools. ǂ2 ericd
690	2	7	Simulation. ǂ2 ericd
[Primary and secondary subject content is identified.]

2nd Indicator

Thesaurus. The thesaurus or subject heading system used in constructing the subject heading. As a result of RLG integration, field 690 has been modified to allow thesaurus information.

	No information provided. No information is provided as to the thesaurus or subject heading system used.

0

Library of Congress subject heading. The formulation of the subject added entry conforms to Library of Congress Subject Headings (LCSH). This includes:

Topical headings (or topical headings and subdivisions) found in the LC subject authority file or in the latest edition of LCSH, including the latest supplements
Topical headings found in the LC subject authority file or in the latest edition of LCSH to which is added a free-floating or regular subdivision according to the rules stated in the Subject Cataloging Manual: Subject Headings, particularly subdivisions listed in the pattern lists and geographic subdivisions
Topical headings not printed in LCSH in the past, but which have been used by LC and which are not likely to have changed (e.g., names of chemical compounds)
Certain music headings with qualifiers specifying instruments or vocal parts when the main heading has a general scope note printed in LCSH, with or without a general see also reference

Use of value 0 requires that the added entry is appropriate for use in LCSH.

1	LC subject heading for children's literature. The formulation of the subject added entry conforms to the "AC Subject Headings" section of Library of Congress Subject Headings. Use of value 1 requires that the added entry is appropriate for use in the LC Annotated Card Program.

2	Medical subject heading. The formulation of the subject added entry conforms to the National Library of Medicine (NLM) authority files. Use of value 2 requires that the added entry is appropriate for use in the NLM authority files.

3	National Agricultural Library subject authority file. The formulation of the subject added entry conforms to the National Agricultural Library (NAL) subject authority file. Use of value 3 requires that the added entry is appropriate for use in the NAL authority files.

4	Source not specified. The formulation of the subject added entry conforms to a controlled list, but the source cannot be specified by one of the thesaurus or subject heading systems covered by the other 2nd indicator values or by a code for a specific subject heading list in subfield ǂ2. Use field 653 to record terms that are not derived from controlled subject heading lists.

5	Canadian subject heading. The formulation of the subject added entry conforms to the Canadian Subject Headings. Use of value 5 requires that the added entry is appropriate for use in Canadian Subject Headings.

6	Répertoire de vedettes-matière. The formulation of the subject added entry conforms to the Répertoire de vedettes-matière maintained by the Bibliothèque de l'Université de Laval. Use of value 6 requires that the added entry is appropriate for use in Répertoire de vedettes-matière.

7

Source is specified in subfield ǂ2 . Subject headings or terms based on other subject authorities (i.e., on authorities other than those listed here). Identify the source in subfield ǂ2.

690

7

Children of pregnant women. ǂ2 henn

Subfields

ǂa Topical term or geographic name as entry element

A locally devised topical subject or geographic name used as an entry element for a topical term. Enter parenthetical qualifying information associated with the term also in subfield ǂa.

690

Baby carriages.

ǂb Topical term following geographic name as entry element

A topical term that is entered under a geographic name in subfield ǂa.

ǂc Location of event

The location at which an event occurred.

ǂd Active dates

The time during which an event occurred.

690

7

Yugoslav War ǂd 1991-1995 ǂ2 [thesaurus code]

ǂe Relator term

A term that specifies the relationship between the topical heading and the described materials, e.g., subject.

ǂg Miscellaneous information

Data element that is not more appropriately contained in another defined subfield.

ǂv Form subdivision

A specific kind or genre of material defined by the thesaurus being used. Use only when a form subject subdivision is added to a main term. Use subfield ǂv also for form terms when they function as indicated above. Use subfield ǂx if the terms function as general subdivisions. A form subdivision in subfield ǂv is generally the last subfield in the field. Repeat subfield ǂv if you use more than one form subdivision.

ǂx General subdivision

A subject subdivision that is not more appropriately contained in subfield ǂv, ǂy or ǂz. Use subfield ǂx only when a general topical subdivision is added to a main term.

690

Dept of Math ǂx Doctoral dissertations ǂy 1984/85.

ǂy Chronological subdivision

A subject subdivision that represents a period of time. Use only when a chronological subject subdivision is added to a main term.

ǂz Geographic subdivision

A geographic subject subdivision. Use only when a geographic subject subdivision is added to a main term.

ǂ1 Real World Object URI

For information about subfield ǂ1, see Control Subfields.

ǂ2 Source of heading or term

A MARC code that identifies the source list from which the heading in a subject added entry was assigned. Use only when the 2nd indicator value is 7. See MARC Code Lists for Relators, Sources, Descriptive Conventions.

ǂ3 Materials specified

For information about subfield ǂ3, see Control Subfields.

ǂ6 Linkage

Data that link fields when non-Latin script is entered. This subfield is system supplied and does not appear in OCLC online displays. Do not manually add subfield ǂ6. For more information about subfield ǂ6, see Control Subfields.

ǂ8 Field link and sequence number

For information about subfield ǂ8, see Control Subfields.

ǂ9 Special entry

For information about subfield ǂ9, see Control Subfields.

Indexing

Field 690 is not indexed.

MARC 21

Field 690 is OCLC-defined and therefore not included in MARC 21 Format for Bibliographic Data.

This page last revised: December 28, 2020

6xx Fields