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 (Subject Added Entry–Topical Term) 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. |
| Master record retention |
Field 690 is not retained in the master record. However, it is retained in archive records, institution records, exported records, and OCLC-MARC records. |
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 ǂy19th century. |
|
|
| |
| 0 |
No level specified. The level of the subject term could be determined, but is not specified.
| 690 |
0 |
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 |
|
|
| |
| 2 |
Secondary. A subject covers a less important aspect of the content of the material.
| 690 |
2 |
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. |
| |
|
Undefined. The first indicator is undefined and contains a blank ( ). |
|
| |
| 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 (Index Term–Uncontrolled) 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 |
|
|
| |
| 8 |
Sears subject heading. OCLC-defined value. The formulation of the subject added entry conforms to the Sears List of Subject Headings. |
|
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.
|
| 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. |
| 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 (http://www.loc.gov/marc/relators/relahome.html). |
| ǂ3 Materials specified |
For information about subfield ǂ3, see Control Subfields. |
| ǂ9 Special entry |
For information about subfield ǂ9, see Control Subfields. |
