First and Second indicators:

#  Undefined


a  Classification number (NR)

b  Item number (NR)

c  Copy information (NR)

u  Custody, permanent (NR)  [Obsolete]

8  Field link and sequence number (R)

NOTE:  See MARC 21 Format for Bibliographic Data (051 Library of Congress Copy, Issue, Offprint Statement) for code definitions not given below.


Field 051 is used to record information relating to additional copies, issues, offprints, detached copies, etc., which are added to the catalog record at the Library of Congress.  The field does not include supplements, indexes, etc., which are related to, but not the same as, the work in the main record.  This field is frequently used for Library of Congress publications when the first two copies are given a call number based on the subject of the publication and additional copies are given a call number assigned to Library of Congress publications.

050 00 Z3191 $b .U53

051 ## Z663.767.P2 $b A25


Editorial instructions for subfields $a and $b are the same as for field 050.

$c  Copy information.

With the implementation of the LC ILS, LC set numbers are generally recorded in local holdings records.  Subfield $c is used in field 051 only when descriptive information is also included with the set number.

051 ## $c 2d set Rosewald Coll.

050 00 QP709 $b .N73

051 ## QE75 $b .G74 $c 2d set

$u  Custody, permanent.

This information is no longer added to CONSER records but existing data remains in OCLC records.

Related fields, etc.


051 Library of Congress Copy, Issue, Offprint Statement  (MARC 21 Format for Bibliographic Data)

See also:

01X-09X  Numbers and Codes

Variable Data Fields

Section E.  MARC 21 Format for Serials as Applied Within CONSER

CONSER Editing Guide:  Contents