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 LC control number is carried in field 001 (Control Number) in records distributed by LC's Cataloging Distribution Service. It may also be carried in field 010$a.

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 and represents the same classification data represented by another record. The structure of the canceled or invalid control number is the same as that used by LC in field 001. Field 010 may or may not contain a subfield $a with the valid control number from the 001 field.

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 Information - Field 010 is an agency-assigned field; it may be used only for an LC control number.

Punctuation - Field 010 does not end in a mark of punctuation.

Capitalization - Prefixes are always input as lowercase alphabetic characters.