This field has no indicators or subfield codes.
MARC code for the agency whose system control number is contained in field 001 (Control Number).
See Appendix G: 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.
Library of Congress >> MARC >> Authority >> 00X >> 003(03/01/2008)