Library of Congress >> MARC >> Bibliographic >> 6XX  >> 648

648 - Subject Added Entry-Chronological Term (R)


MARC 21 Bibliographic - full
April 2013

First Indicator Second Indicator
Type of date or time period
# - No information provided
0 - Date or time period covered or depicted
1 - Date or time period of creation or origin

Thesaurus
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


Subfield Codes

Main term portion

  • $a - Chronological term (NR)

Subject subdivision portion

  • $v - Form subdivision (R)
  • $x - General subdivision (R)
  • $y - Chronological subdivision (R)
  • $z - Geographic subdivision (R)

Control subfields

  • $0 - Authority record control number or standard number (R)
  • $2 - Source of heading or term (NR)
  • $3 - Materials specified (NR)
  • $6 - Linkage (NR)
  • $8 - Field link and sequence number (R)


FIELD DEFINITION AND SCOPE

Subject added entry in which the entry element is a chronological term.

Subject added entries are assigned to a bibliographic record to provide access according to generally accepted thesaurus-building rules (e.g., Library of Congress Subject Headings (LCSH), Medical Subject Headings (MeSH), Faceted Application of Subject Terminology (FAST)). Field 648 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).


GUIDELINES FOR APPLYING CONTENT DESIGNATORS

Content designators identify the subelements occurring in chronological terms and subdivisions.

INDICATORS

First Indicator - Type of date or time period

# - No information provided
0 - Date or time period covered or depicted

648 17$a1860-1865$2fast
648 07$a1860-1865$2fast
[A collection, published 1969, of letters dated 1860-1865. The period depicted and created are the same.]
1 - Date or time period of creation or origin

648 10$aNineteenth century.
648 17$a203-1486$2fast
648 10$aMiddle Ages.
648 17$a1932-1940$2fast
648 10$aNineteen thirties.
648 10$aNineteen forties.

Second Indicator - Thesaurus

Subject heading system or thesaurus used in constructing the subject heading.

0 - Library of Congress Subject Headings

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.

1 - LC subject headings for children's literature

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.

2 - Medical Subject Headings

Subject added entry conforms to and is appropriate for use in the National Library of Medicine authority files.

3 - National Agricultural Library subject authority file

Subject added entry conforms to and is appropriate for use in the National Agricultural Library subject authority file.

4 - Source not specified

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.

5 - Canadian Subject Headings

Subject added entry conforms to and is appropriate for use in the Canadian Subject Headings that is maintained by the Library and Archives Canada.

6 - Répertoire de vedettes-matière

Subject added entry conforms to the Répertoire de vedettes-matière that is maintained by the Bibliothèque de l'Université Laval.

7 - Source specified in subfield $2

Subject added entry conforms to a set of subject heading system/thesaurus building rules. The identifying code is given in subfield $2.

SUBFIELD CODES

$a - Chronological term

648 #7$a1900-1999$2fast
648 #7$a1862$2fast
648 #7$a1800-1899$2fast

$v - Form subdivision

Form subdivision that designates a specific kind or genre of material as defined by the thesaurus being used. Subfield $v is appropriate only when a form subject subdivision is added to a main term.

$x - General subdivision

Subject subdivision that is not more appropriately contained in subfields $v (Form subdivision), $y (Chronological subdivision), or $z (Geographic subdivision). Subfield $x is appropriate only when a general topical subdivision is added to a main term.

$y - Chronological subdivision

Subject subdivision that represents a period of time. Subfield $y is appropriate only when a chronological subject subdivision is added to a main term.

$z - Geographic subdivision

Geographic subject subdivision. Subfield $z is appropriate in field 648 only when a geographic subject subdivision is added to a main term.

$0 - Authority record control number or standard number

See description of this subfield in Appendix A: Control Subfields.

$2 - Source of heading or term

MARC code that identifies the source list from which the subject added entry was assigned. It is used only when the second indicator position contains value 7 (Source specified in subfield $2). Code from: Subject Heading and Term Source Codes.

648 #7$a1900-1999$2fast
648 #7$a1862$2fast
648 #7$a1800-1899$2fast

$3 - Materials specified

Part of the described materials to which the field applies.

$6 - Linkage

See description of this subfield in Appendix A: Control Subfields.

$8 - Field link and sequence number

See description of this subfield in Appendix A: Control Subfields.


INPUT CONVENTIONS

Display Constant

- [dash associated with the content of subfield $v, $x, $y, or $z]

Dash ( - ) that precedes a subject subdivision in an extended subject heading is not carried in the machine-readable record. It may be system generated as a display constant associated with the content of subfield $v, $x, $y, and $z.


CONTENT DESIGNATOR HISTORY

Indicator 1 - Type of date or time period [NEW, 2013]
# - No information provided [NEW, 2013]

0 - Date or time period depicted [NEW, 2013]

1 - Date or time period of creation or origin [NEW, 2013]

Prior to 2013 Indicator 1 was undefined.

$0 - Authority record control number or standard number [NEW, 2007]

Library of Congress >> MARC >> Bibliographic >> 6XX  >> 648
(04/29/2013)
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