Information:
The Library of Congress Control Number (LCCN) is a
number assigned by the Library of Congress to an
individual bibliographic item for all MARC records
distributed by LC. In the MARC Bibliographic format
the LCCN is entered into the 010 tag. This field is
often used by the software for electronic data
matching during import or automated retrospective
conversion.
The Library of Congress control numbering system has
had the same basic structure since its initial use in
1898. However, on January 1, 2001, the structure
changed to accommodate a four digit year. The new
structure applies to LCCNs assigned in 2001 and
forward. LCCNs assigned from 1898 to 2000 will not be
changed to reflect the new structure. Under both
structures, the prefix, year, and serial number are
the basic elements required to make a LCCN unique.
1898-2000 LCCN structure
Element name Number of characters
Alphabetic prefix 3
Year 2
Serial number 6
Supplemental number 1
Suffix and/or Revision Date variable
2001 LCCN structure
Element name Number of characters
Alphabetic prefix 2
Year 4
Serial number 6
Indicators
First Undefined
blank Undefined
Second Undefined
blank Undefined
Subfields
a Library of Congress Control Number (LCCN) (NR)
z Canceled/invalid LC Control Number (R)
At one time the Library of Congress added prefixes to
their numbers; however, this is no longer the general
practice. Prefixes of varying lengths were used by LC
prior to 1969 for book items and 1972 for non-book
items. Whether the prefixes are added or not depends
on the individual system. In the Follett system the
prefixes are not part of the search strategy.
The year portion of the LCCN in the 1898-2000
structure consists of two digits normally representing
the year the record was created. In the 2001
structure, the year consists of 4 digits.
The serial number portion consists of one to six
digits.
Some LCCNs have a suffix following them. The letters
that follow the LCCN are preceded by a "space-slash".
Suffixes have not been added by the Library of
Congress since 1969 and the ones that were added
were deleted from their file. Below is a list of
the valid letters that have been used for a suffix:
AC used on records included in the Annotated
Card" program
AM used for works in Amharic
ACN used for works in Chinese
AJ used for works in Japanese
AK used for works in Korean
F used for records created by the Audiovisual
Section, Special Materials Cataloging
Division for motion pictures, filmstrips,
sets of slides and transparencies,
videorecordings, etc.
HE used for works published in the Hebrew
alphabet regardless of the language
M used for works classed in M in the Library
of Congress Call Number scheme
MAP used for atlases
MN used for works classed in ML and MT in the
Library of Congress Call Number scheme
MP used for records created by the Motion
Picture, Broadcasting and Recorded Sound
Division
NE used for works in Armenian, Arabic,
Georgian, Ottoman Turkish, Persian, Pushto,
and Turkish, as well as any non-Slavic
language of Central Asia written in the
Cyrillic alphabet
PP used for records created by the prints and
Photographs Division
R used for all sound recordings
Prior to 1999, a revision date was occasionally
included after the LCCN. The revision date was
preceded by one or two slashes. This date specified
the latest date that the data was worked on by LC.
The inclusion of revision dates was discontinued in
1999 and these dates have been deleted from all records
in the Library of Congress files.
For an invalid or canceled LCCN the information is
entered into subfield z in the same manner as it would
be entered into subfield a. This would occur if the
LCCN for an original hardback would appear in a
different edition of an item such as the paperback
edition or for some reason the Library of Congress
canceled the number.
Punctuation
There are never any marks of punctuation at the end of
the 010 tag.
Examples:
LCCNs from 1898-2000
010 _a 91894321
(Printed number is 91-894321)
010 _a 77389 /AC
(Printed number is 77-389 with AC printed
below the number)
010 _a 76647633
_zsc 76587
(Printed number is 76-647633)
010 _a 8945672 //r92
(Printed number is 89-45672 revised in 1992)
010 _a 91691938
_z 82692384
(Printed number is 91-691938 with canceled
number 82-692384 printed below)
LCCN under the 2001 structure
010 _a 200145944
(Printed number is 2001-45944
010 _a 20016873
(Printed number is 2001-6873)
010 _a 2001943212
(Printed number is 2001-943212)
010 _a 2001-8432
_z 2001-56313
(Printed number is 2001-8432 with a canceled
number 2001-56313 printed below.)
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