Fields 600-65X (with the exception of field 653 that is used for uncontrolled index terms) contain subject headings or access terms that provide additional access to a bibliographic record through a heading or term that is constructed according to established subject cataloging or thesaurus-building principles and guidelines. The standard list or authority file used is identified by the MARC source code contained in subfield $2 that is used in conjunction with value 7.
[Additional Fields in MARC 21 Concise Formats]
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