Definition |
A chronological term used as a subject added entry. Subject added entries are assigned to a bibliographic record to provide access according to established subject cataloging principles and guidelines. Field 648 may be used by any institution assigning subject headings based on the lists and authority files identified in the 2nd indicator position or in subfield ǂ2. For information about FAST (Faceted Application of Subject Terminology) subject access points, see 6xx Introduction. |
1st Indicator |
Undefined. The 1st indicator position is undefined and contains a blank.
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Undefined |
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2nd Indicator |
Thesaurus. The thesaurus or subject heading system used in constructing the subject heading. Note: Prefer use of 2nd indicator values 0, 1, 2, 3, 5, or 6 when 2nd indicator value 7 with codes lcsh, cyac (formerly lcac), mesh, nal, cash, or rvm in subfield ǂ2 would convey the same information. Prefer use of 2nd indicator value 4 instead of value 7 and subfield ǂ2 local. |
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| 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 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 Headings Manual (formerly called 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. |
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| 1 |
LC subject heading for children's literature. The formulation of the subject added entry conforms to the "Children's and Young Adults' Cataloging Program" (CYAC) section of Library of Congress Subject Headings. Use of value 1 requires that the added entry is appropriate for use in the Children's and Young Adults' Cataloging Program. |
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| 2 |
Medical subject heading. The formulation of the subject added entry conforms to the Medical Subject Headings (MeSH) maintained by the National Library of Medicine (NLM). Use of value 2 requires that the added entry is appropriate for use in the MeSH. |
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| 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. |
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| 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. |
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| 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. |
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| 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. |
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| 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. |
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Subfields |
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| ǂa Chronological term |
A chronological name used as an entry element for a topical term. Enter parenthetical qualifying information associated with the term also in subfield ǂa.
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| ǂe Relator term |
A designation of function that describes the relationship between the chronological term and a work.
| 648 |
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7 |
| 1793-1794, ǂe setting. ǂ2 fast ǂ4 stg ǂ0 (OCoLC)fst02010881 |
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| 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.
| 648 |
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7 |
Twentieth century ǂv Indexes. ǂ2 [thesaurus code] |
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| 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.
| 648 |
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7 |
Twentieth century ǂx Social life and customs. ǂ2 [thesaurus code] |
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| 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.
| 648 |
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7 |
Twentieth century ǂy Nineteen twenties. ǂ2 [thesaurus code] |
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| ǂz Geographic subdivision |
A geographic subject subdivision. Use only when a geographic subject subdivision is added to a main term.
| 648 |
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7 |
Renaissance ǂz Italy ǂ2 [thesaurus code] |
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| ǂ0 Authority record control number or standard number |
For information about subfield ǂ0, see Control Subfields. |
| 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 subject added entry was assigned. Use only when the 2nd indicator value is 7. See Subject Heading and Term Source Codes.
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| ǂ3 Materials specified |
For information about subfield ǂ3, see Control Subfields.
| 648 |
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7 |
ǂ3 Letters ǂa 1609-1621 ǂ2 [thesaurus code] |
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| ǂ4 Relationship |
For information about subfield ǂ4, 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. |
| ǂ7 Data provenance |
For information about subfield ǂ7, see Data Provenance Subfields. |
| ǂ8 Field link and sequence number |
For information about subfield ǂ8, see Control Subfields. |
Indexing |
For indexing and searching information, see Searching WorldCat Indexes, field 648. |
MARC 21 |
For more information, including content designator history, see MARC 21 Format for Bibliographic Data, field 648. |
