003 Control Number Identifier (NR) (Variable Control Field)
Field definition and scope:
Field 003 contains the USMARC code for the agency whose system control number is present in field 001 (Control Number) . The source of this code is USMARC Code List for Organizations that is maintained by the Library of Congress.
Whenever the number in field 001 is changed, agencies must assure that the USMARC code in field 003 applies to the number found in the 001 field.
Field 003 is NOT repeatable . It has no indicators or subfield codes . This field is usually system generated.
See: Examples
Related USMARC fields or documents:
USMARC Code List for Organizations
See also:
