Authority 003 szerkesztése (szakasz)

==Field Definition and Scope==
MARC code for the agency whose system control number is contained in field 001 (Control Number).

See Appendix G: [http://www.loc.gov/marc/authority/ecadorg.html Organization Code Sources] for a listing of sources used in MARC 21 records.

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.