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Concise Formats - 2008 Archive >> Classification >> Tracings and References >> 5XX

Valid Number Tracing Fields (5XX)

This is an ARCHIVED VERSION of the 2008 electronic edition of the MARC 21 Concise Formats. Please see loc.gov/marc/concise/ for the most up-to-date version of the electronic MARC 21 Concise Formats.

Fields in this group are used to trace references from one valid classification number to another. In the MARC 21 classification format, only one Valid Number Tracing field is currently defined.