010  Library of Congress Control Number (NR)  (Variable Data Field)

Field definition and scope:

Field 010 contains a unique number assigned to a record by the Library of Congress (LC) or a cooperative cataloging partner contributing authority records to the Name Authority Cooperative Program (NACO) database.  The field is also used for unique numbers assigned to a record created by LC for the Library of Congress Subject Headings (LCSH).

The LC control number is carried in field 010 subfield $a and field 001 (Control Number) in records distributed by LC's Cataloging Distribution Service.

An LC record may contain field 010 with a canceled or invalid control number of a previously-distributed record.  A record may be canceled because it is a duplicate of the same heading represented by another record.  The structure of the canceled/invalid control number is the same as that used by LC in field 001.

The National level record requirement for this field is Mandatory if applicable.

Field 010 is NOT repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National level (NLR) record requirements, and designator repeatability, see table below:

See:  Example for this field.

Structure:

LC Control Number Structure

Input conventions:

Agency-assigned field

Punctuation

Capitalization

LC Guidelines:

 010  Library of Congress Control Number

DCM Z1 Instructions:

 010  Library of Congress Control Number

Related MARC field or document:

001  Control Number

See also:

0XX  Numbers and Codes

Variable Data Fields