|First Indicator||Second Indicator|
0-9 - Number of nonfiling characters
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
Subject added entry in which the entry element is a uniform title.
Subject added entries are assigned to a bibliographic record to provide access according to established subject cataloging principles and guidelines. Field 630 may be used by any institution assigning subject headings based on the lists and authority files identified in the second indicator position or in subfield $2 (Source of heading or term).
Title used in phrase subject headings (e.g., Bible and atheism) is contained in field 650 (Subject Added Entry-Topical Term).
Description of the first indicator position and all subfield codes, as well as input conventions for the 630 field are given in the X30 Uniform Titles-General Information section. Because the second indicator is different for various fields, it is not described in the general information section, but is described below.
Second Indicator - Thesaurus
Subject heading system or thesaurus used in constructing the subject heading.
Subject added entry conforms to and is appropriate for use in the Library of Congress Subject Headings (LCSH) and the Name authority files that are maintained by the Library of Congress.
Subject added entry conforms to the "AC Subject Headings" section of the Library of Congress Subject Headings and is appropriate for use in the LC Annotated Card Program.
Subject added entry conforms to and is appropriate for use in the National Library of Medicine authority files.
Subject added entry conforms to and is appropriate for use in the National Agricultural Library subject authority file.
Subject added entry conforms to a controlled list that cannot be identified by second indicator values 0-3, 5-6 or by a code in subfield $2. Field 653 (Index Term-Uncontrolled) is used to record terms that are not derived from controlled subject heading lists.
Subject added entry conforms to and is appropriate for use in the Canadian Subject Headings that is maintained by the Library and Archives Canada.
Subject added entry conforms to the Répertoire de vedettes-matière that is maintained by the Bibliothèque de l'Université Laval.
Subject added entry conforms to a set of subject heading system/thesaurus building rules. The identifying code is given in subfield $2.
|630||00$aBerliner revue$xHistory$y20th century.|
|630||05$aStudio magazine.$pContemporary paintings$vPeriodicals.|
|630||00$aMS-DOS (Computer file)|
|630||00$aFour seasons (Motion picture : 1981)|
[Photo of the Domesday book.]
|-||[dash associated with the content of subfield $v, $x, $y, and $z]|
Dash (-) that precedes a subdivision in an extended 630 subject heading is not carried in the MARC record. It may be system generated as a display constant associated with the content of subfield $v, $x, $y, and $z.