Cross posted; apologies for the duplication
Library of Congress Control Number (LCCN) Restructuring
The Library of Congress Control Number (formerly Library of
Congress Card Number) is a number that has been used since 1898
to uniquely identify bibliographic records. Today, the beginning
two digits of the number represent the year, with the century
being implicit, e.g., 00008000 or 00-008000 or 00-8000.
Beginning January 2, 2001 the year portion is being expanded
to make the century explicit, e.g., 2001008000 or 2001-008000 or
2001-8000. Searching LCCNs per se in the LC ILS is not changed
as the result of implementing the four-digit year. There are
just two more digits at the beginning of the number that need
to be input at the time of the search. The restructuring applies
both to authority and bibliographic records.
Some examples of the new structure for bibliographic records are:
Sometimes for printed displays a hyphen is used to separate the year
portion from the serial number:
2001-000001 or 2001-1
sn2001-058000 or sn2001-58000
Note that a hyphen is NEVER used in the machine representation
of an LCCN, and it should not be used in searching an LCCN in
the LC ILS.
Numbers assigned under the old structure will not be changed.
For those interested in detailed information about the old
and new structures of the LCCN, see the documentation under
"LCCN Restructuring to Four-Digit Year" on the Cataloging
Policy and Support Office home page at the following address:
Send any questions about this change to the Cataloging Policy and
Support Office at: [log in to unmask]
Cataloging Policy and Support Office
posted at the request of CPSO by A. Cristán