010 Library of Congress Control Number (NR) (Variable Data Fields)
First and second indicator :
# Undefined
a LC control number (NR)
b NUCMC control number [Not applicable]
z Cancelled/invalid LC control number (R)
Description/Instructions:
The LIBRARY OF CONGRESS CONTROL NUMBER is the unique number assigned to an authenticated CONSER record . It is used to manage the processing of the record at the Library of Congress.
The LC control number (LCCN) is input, displayed, and output by OCLC to LC in field 010 (subfield $a). The LCCN is distributed by LC in both fields 010 and 001 . LC control numbers are assigned by all CONSER members to records that are originally input, to existing records that were not previously authenticated, and in some cases, to previously authenticated records. See the section: "CONSER assignment of LCCNs" for further information.
Regular LC control numbers:
Regular LC control numbers are assigned only by the Library of Congress for records newly input or adapted from existing records. The number consists of the last two digits of the year, a hyphen, and a consecutively assigned number. Example:
NOTE: Earlier forms of the LC control number are still valid for retrospective input. For instructions, see Appendix P.
Prefixes:
LC control numbers on records for works cataloged prior to Dec. 1, 1968 may be preceded by alphabetic prefixes. These prefixes can be from one to three characters in length, and are carried in the machine record as lowercase alphabetic characters. No space is input between the prefix and the control number. (However, on output to magnetic tape, trailing blanks are inserted as fillers if the prefix is less than three characters.) For a complete list of prefixes, see Appendix P. Example:
Pseudo LC control numbers:
Numbers structured like LC control numbers, and identified by a prefix, are used in CONSER records for which no regular LC control number exists at the time of authentication . Pseudo LC control numbers are needed to enable LC to store such records on its database and to distribute them through the CDS MARC Distribution Service. The pseudo LC control numbers have their own sequential numbering scheme, i.e., the prefix is a significant part of the numbering inasmuch as the numeric portion may also be valid for other prefixed LC control numbers as well as regular LC control numbers.
CONSER assignment of LCCNs:
1. LC full level catalogers:
A regular (un-prefixed) LCCN is assigned to records originally input, records that are authenticated for the first time, and to previously authenticated CONSER records for serials that are held by LC. When adding an LCCN to a previously authenticated record, the pseudo-control number is moved to subfield $z. (See subfield $z, for further information.) LC full level catalogers assign "sf"-prefixed LCCNs to serial records for monographic series titles that are classed separately and analyzed in full. They also assign "sc"-prefix LCCNs to CONSER records that are authenticated from a surrogate when the title is not held by LC.
2. LC minimal level catalogers:
An "sf"-prefixed number is assigned to records originally input, and those previously authenticated with an "sc", "sn", or Canadian prefix. When adding the "sf" prefix to a previously authenticated record, MLC catalogers move the existing LCCN to subfield $z.
3. NLC catalogers:
A "ce", "cf", or "cn"-prefixed number is assigned to records originally input or authenticated for the first time, as specified above. NLC catalogers changed the LCCN on an already authenticated record only on English records for bilingual serials (see the "Note" under "Pseudo-LC control numbers").
4. CONSER catalogers, NSDP, and NST:
An "sn"-prefixed number is assigned to all records originally input or authenticated for the first time. CONSER catalogers do not assign a new "sn"-prefixed LCCN to any record that is already authenticated.
Suffixes/Alphabetic identifiers:
Special symbols, called alphabetic identifiers, are appended to control numbers of categories of materials to control the distribution of records and cards to various LC book and card catalogs. These are input as suffixes, following the control number. The following are valid alphabetic identifiers:
AM | Amharic | ACN | Chinese |
AJ | Japanese | AK | Korean |
HE | Hebrew | NE | Armenian, Arabic, Georgian, Persian, Pushto, and Turkish, as well as non-slavic languages of Central Asia written in the Cyrillis alphabet. |
MAP | Atlases | F | Filmstrips |
M | Music, classed in M | MN | Music, classed in ML, MT |
R | Sound recordings |
When inputting alphabetic identifiers, separate the identifier from the last numeral of the control number by one slash. Example:
When LC adds, changes, or deletes an access point in an LC authenticated record, an indication that a revision has been made is given by the addition of a lowercase "r" and the last two digits of the year of the last revision. If a record has been revised more than once, the number of the revision is given after the date of the last revision. CONSER members add a revision date to non-pseudo LCCNs when changing a pre-AACR2 record to AACR2 (see also C3 , C9 ). Example:
Related fields, etc.
C1 , C2 , 001 , 016 , Appendix P
See also:
