010 Library of Congress Control Number

Field definition and scope:

Field 010 contains a unique number assigned to a record by the Library of Congress. The control number for MARC records distributed by LC is referred to as an LC control number (LCCN).

The LC control number is carried in field 001 (Control Number) in records distributed by LC's Cataloging Distribution Service and in field 010 $a. An organization using LC records may remove the LC control number from field 001 and use field 001 for its own system control number.

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 record for the same item. The structure of the canceled or invalid control number is the same as that used by LC in field 001.

Field 010 is NOT repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, and designator repeatability, see table below:

Position	Description	Repeatability
Field 010	Library of Congress Control Number	NR
Indicator:
First	Undefined; contains a blank
Second	Undefined; contains a blank

Subfield code:
$a	LC control number	NR
$z	Canceled/invalid LC control number	R
$8	Field link and sequence number	R

Structure:

LC Control Number Structure

Input conventions:

Agency-assigned field

Punctuation

Capitalization