648 - Subject Added Entry-Chronological Term (R)
MARC 21 Bibliographic - Full
October 2007
First Indicator
Undefined
# - Undefined
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Second Indicator
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
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Subfield Codes
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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 (R)
$2 - Source of heading or term (NR)
$3 - Materials specified (NR)
$6 - Linkage (NR)
$8 - Field link and sequence number (R)
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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 - Undefined Undefined and contains a blank (#).
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. Conforms
to
LCSH is defined as:
- headings (or headings and subdivisions) found in the LC authority files
(including name authorities), or in the latest edition of LCSH,
including the latest microfiche, printed version, CD-ROM, and supplements;
- headings constructed following AACR2;
- headings found in the LC authority files, the latest edition of
LCSH, or constructed following AACR2 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
formulated and applied according to the rules in the manual;
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
$a - Chronological term
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| 648 |
#7$a1900-1999$2fast
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| 648 |
#7$a1862$2fast
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| 648 |
#7$a1800-1899$2fast
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$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
$2 - Source of heading or term
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| 648 |
#7$a1900-1999$2fast
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| 648 |
#7$a1862$2fast
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| 648 |
#7$a1800-1899$2fast
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$3 - Materials specified Part of the described materials to which the field applies.
$8 - Field link and sequence number
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
$0 - Authority record control number [NEW, 2007]