010 Library of Congress Control Number (NR) (Variable Data Field)
Field 010 contains unique numbers that have been assigned to a bibliographic record by the Library of Congress. The control number for MARC records distributed by LC is 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/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) and Minimal-level (MLR) record requirements , and designator repeatability , see table below:
Position | Description | NLR | MLR | Repeatability |
Field 010 | Library of Congress Control Number | A | A | NR |
Indicator: | ||||
First | Undefined; contains a blank | M | ||
Second | Undefined; contains a blank | M | ||
Subfield code: | ||||
$a | A | A | NR | |
$b | A | A | R | |
$z | A | A | R | |
$8 | O | O | R |
Structure:
Related MARC fields or documents:
National Union Catalog of Manuscript Collections
See also:
MARC Format Documentation and Code Lists
