648 - Subject Added Entry-Chronological Term (R)
MARC 21 Community Information - 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)
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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 entry in which the first element is a chronological term.
Subject added entries are assigned to a community information 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
Subelements occurring in chronological terms and subdivisions.
■ INDICATORS
First Indicator - Undefined Undefined and contains a blank (#).
Second Indicator - Thesaurus Thesaurus or authority file from which the heading came.
0 - Library of Congress Subject Headings Added entry conforms to the
Library of Congress Subject Headings
(LCSH)and the Name authority files.
LCSH is maintained by the Library of Congress. Use of Value 0 requires
that the heading is appropriate for use in
LCSH.Conforms to
LCSH is defined as:
- headings (or headings and subdivisions) found in the LC subject authority
file or in the latest edition of LCSH, including the latest
microfiche, printed version, CD-ROM, and supplements;
- 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 Cataloging Manual: Subject
Headings, particularly subdivisions listed in the pattern lists, and
geographic subdivisions formulated and applied according to the rules in the
manual;
- 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).
1 - LC subject headings for children's literature Subject added entry conforms to the "AC Subject Headings" section of
Library of Congress Subject Headings (LCSH).LCSH is maintained by the Library of Congress. Use of Value 1 requires
that the field is appropriate for the LC Annotated Card Program.
2 - Medical Subject Headings Subject added entry conforms to the NLM authority files, Medical Subject
Headings (MeSH).MeSH is maintained by the National Library of Medicine. Use of value 2
requires that the field is appropriate for use in MeSH.
3 - National Agricultural Library subject authority file Subject added entry conforms to the National Agricultural Library subject
authority file. Use of value 3 requires that the field is appropriate for National Agricultural
Library subject heading purposes.
4 - Source not specified Subject added entry conforms to a controlled list that cannot be identified by
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 Canadian Subject Headings.Canadian Subject Headings is maintained by 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
■ 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 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 $2).
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648 |
#7$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 - The 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]