The codes should not be used in exchange records until after Decenber 19, 2006. This 60-day waiting period is required to provide MARC 21 implementers time to include newly defined codes in any validation tables they may apply to the MARC fields where the codes are used.
The following code is for use in subfield $e in field 040 (Cataloging Source) in Authority and Bibliographic records.
- Descriptive cataloging of rare materials (Books). (Washington, DC: Cataloging Distribution Service, Library of Congress) [use after December 19, 2006]
The following code is for use in subfield $2 in Bibliographic and Community information records in 6xx fields and in subfield $f in field 040 (Cataloging Source) in Authority records.
- Soubor vecnych autorit Narodni knihovny CR = CZENAS thesaurus: a list of subject terms used in the National Library of the Czech Republic (Praha : Narodni knihovna Cseke republiky) [use after December 19, 2006]