The Library of Congress is the maintenance agency for the source code lists.  All assignments are made as the result of an official request.  Please send requests for the assignment of new source codes and questions about existing code assignments to:  Network Development and MARC Standards Office, Library of Congress, 101 Independence Avenue, S.E., Washington, DC 20540-4402, USA; Fax: +1-202-707-0115; Email:  Requests for the assignment of a new source code should include a full bibliographic citation for the source documentation or web site for the code or term list, code or term database, scheme (e.g., for classification schedules), or rules (e.g., for description conventions).   For printed sources, include a copy of the title page.  For online sources, include the URL.

Notices announcing additions or changes to assigned codes and their related citations are distributed prior to the date they should be used in records in the News and Announcements section of the MARC site.

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