"Full" documentation refers to the
MARC 21 Format for Bibliographic Data
that contains detailed
descriptions of every data element, along with examples, input
conventions and history sections.
"Concise" documentation refers to the
MARC 21 Format for Bibliographic Data
that contains
abridged descriptions of every data element, along with
examples.
6XX fields contain subject access entries and terms. Most of these fields contain
subject added entries or access terms based on the lists and authority files
identified in the second indicator (Subject heading system/thesaurus) or in subfield
$2 (Source of subject heading or term). One field contains uncontrolled
subject access data.
For mixed materials and collections under archival control,
considerable use is made of the 6XX fields to reflect the subject content of the
described materials through controlled and uncontrolled headings and terms. The
7XX
fields are used less frequently to provide access.
Descriptions of the first indicator and all subfield codes, as well as input
conventions for the 600, 610, 611, and 630 fields, are given in the following
General Information sections: X00, X10, X11 and X30. The
second indicator is described in the specific section for each field. All content
designators for the 650-658 fields are described in the specific section for each
field.
Field 600-651 - Subject added entries
Indicator 2 - Subject heading system/thesaurus
In 1982 the use of the second indicator value in subject added entry fields
600-651 was expanded from specifying the organization that
assigned the subject added entry to specifying the subject
heading system, thesaurus, or authority file used by an
organization to assign the subject added entry. Accordingly, values 0-3 and 5-6
became authoritative-agency data elements and their definitions were changed
to
the names of the list or authority file. The definition of value 4 was changed
from Other subject heading. Prior to 1975, value 5 was defined in the visual
materials specifications as Subject heading to be printed only in LC book
catalog. Prior to 1977, value 5 was defined in the archival and manuscripts
control specifications as National Union Catalog of Manuscripts (NUCMC) subject
heading.
Field 647 - Subject Added Entry-Named Event [NEW, 2016]
Field 648 - Subject Added Entry-Chronological Term [NEW, 2002]
Field 652 - Subject Added Entry-Reversed Geographic [OBSOLETE, 1980]Field 652 was an agency-defined field used by the Library of Congress for
reversed geographic added entries assigned to materials classed in LC
classification number span G1000-G9999. For each regular Topic-Place
subject heading assigned, a reversed Place--Topic heading was also
assigned. Both indicator positions were undefined. The subfield codes were:
$a (Geographic name or place element), $x (General subject
subdivision), $y (Chronological subject subdivision), $z
(Geographic subject subdivision).
Field 662 - Subject Added Entry - Hierarchical Place Name [NEW, 2005]
Field 680 - PRECIS Descriptor String [OBSOLETE, 1991] [CAN/MARC only]PRECIS Descriptor String is a sequence of subject index terms in which each term
is preceded by a code which determines how it should appear in entries generated
by a computer. The first indicator was undefined. The second indicator values
0-9 were used to link alternative subject statements to the corresponding Dewey
classification number. Subfields $a-$z contained the text
of the PRECIS Descriptor String.
Field 681 - PRECIS Subject Indicator Number (SIN) [OBSOLETE, 1991] [CAN/MARC only]PRECIS Subject Indicator Number (SIN) is a fixed-length number ending in a
modulus 11 check digit. It identifies uniquely the address of the PRECIS data
consisting of string and Reference Indicator Number (RIN). The first indicator
was undefined. The second indicator values 0-9 were used to link the indicator
to the corresponding PRECIS string and other associated subject data. Only
subfield $a (PRECIS subject indicator number (SIN)) was defined.
Field 683 - PRECIS Reference Indicator Number (RIN) [OBSOLETE, 1991] [CAN/MARC only]PRECIS Reference Indicator Number (RIN) is a fixed-length number ending in a
modulus 11 check digit which identifies the address of a term in the
machine-held thesaurus used as the source of 'See' and 'See also' references in
a printed index. The first indicator was undefined. The second indicator values
0-9 were used to link the index numbers to the corresponding PRECIS descriptor
string. Only subfield $a (Reference indicator number (RIN)) was
defined.