Where do I find the U.S. National Level/Minimal Level Record Requirements for the MARC 21 formats?
There is no list of of “mandatory” data elements that must appear in a MARC 21 record. Thereotically, a record could simply consist of a leader and a 245 (title) field. However, there is a list of the MARC 21 data elements required to meet minimal and national level requirements in the United States for the bibliographic and authority formats. Please note that other countries may have different lists of required data elements.
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