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648  Subject Added Entry–Chronological Term (R)

Input Standards

Required if applicable/Optional
1st Indicator  Undefined
blank character Undefined
2nd Indicator  Thesaurus
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 ‡2
Subfields (R=Repeatable  NR=Nonrepeatable) Input Standards
‡a Chronological term (NR) Mandatory/Mandatory
‡v Form subdivision (R) Required if applicable/Required if applicable
‡x General subdivision (R) Required if applicable/Required if applicable
‡y Chronological subdivision (R) Required if applicable/Required if applicable
‡z Geographical subdivision (R) Required if applicable/Required if applicable
‡0 Authority record control number (R) Optional/Optional
‡2 Source of heading or term (NR) Required if applicable/Required if applicable
‡3 Materials specified (NR) Optional/Optional

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 ‡2.

1st Indicator

Undefined. The 1st indicator position is undefined and contains a blank ( blank character ).

blank character

Undefined

2nd Indicator

Thesaurus. The thesaurus or subject heading system used in constructing the subject heading.

 
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.

 
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 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.

 
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 ‡2. 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 ‡2 . Subject headings or terms based on other subject authorities (i.e., on authorities other than those listed here). Identify the source in subfield ‡2.

Subfields

 
‡a 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 ‡a.

648   7 509 B.C. ‡2 fast
648   7 1876 ‡2 fast
648   7 To 1939 ‡2 fast
648   7 Since 1990 ‡2 fast
‡v 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 ‡v also for form terms when they function as indicated above. Use subfield ‡x if the terms function as general subdivisions. A form subdivision in subfield ‡v is generally the last subfield in the field. Repeat subfield ‡v if you use more than one form subdivision.

648   7 Twentieth century ‡v Indexes. ‡2 [thesaurus code]
‡x General subdivision

A subject subdivision that is not more appropriately contained in subfield ‡v, ‡y or ‡z. Use subfield ‡x only when a general topical subdivision is added to a main term.

648   7 Twentieth century ‡x Social life and customs. ‡2 [thesaurus code]
‡y 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   7 Twentieth century ‡y Nineteen twenties. ‡2 [thesaurus code]
‡z Geographical subdivision

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

648   7 Renaissance ‡z Italy ‡2 [thesaurus code]
‡0 Authority record control number

Subfield ‡0 (zero) contains the system control number of the related authority record or a standard identifier such as an International Standard Name Identifier (ISNI). The control number or identifier is preceded by the appropriate MARC Organization code (for a related authority record) or the Standard Identifier source code (for a standard identifier scheme), enclosed in parentheses. See MARC Code List for Organizations (http://www.loc.gov/marc/organizations/orgshome.html) for a listing of organization codes and Standard Identifier Source Codes (http://www.loc.gov/standards/sourcelist/standard-identifier.html) for code systems for standard identifiers. Subfield ‡0 is repeatable for different control numbers or identifiers.

Do not input subfield ‡0 in master records, instead use the control headings function. Local authority identifiers may be entered in subfield ‡0 locally, but should not be added to master records in WorldCat.

‡2 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 (http://www.loc.gov/standards/sourcelist/subject.html).

648   7 1876 ‡2 fast
648   7 1609-1621 ‡2 gtt
‡3 Materials specified

The part of the described materials to which the field applies.

648   7 ‡3 Letters ‡a 1609-1621 ‡2 [thesaurus code]

Indexing

For indexing and searching information, see Searching WorldCat Indexes, field 648.

Printing

Field 648 does not print.