003 Control Number Identifier (NR) (Variable Control Field)
Field definition and scope:
Field 003 contains the MARC code for the agency whose system control number is contained in field 001(Control Number) . For organizations in the U.S. and countries other than Canada, the source of this code is the MARC Code List for Organizations that is maintained by the Library of Congress. For Canadian organizations, the source of the code is Symbols and Interlibrary Loan Policies in Canada that is maintained by the National Library of Canada.
Whenever the number in field 001 is changed, agencies must assure that the MARC code in field 003 applies to the number found in the 001 field.
National-level and Minimal-level record requirements for field 003 are Mandatory.
Field 003 is NOT repeatable .
Guidelines for applying content designation:
Field 003 has no indicators or subfield codes .
See: Examples
Input conventions:
Field 003 is usually system generated.
Related MARC fields or documents:
MARC Code List for Organizations
Symbols and Interlibrary Loan Policies in Canada
See also:
