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Concise Formats - 2008 Archive >> Classification >> Tracings and References >> 4XX

Invalid Number Tracing Fields (4XX)

This is an ARCHIVED VERSION of the 2008 electronic edition of the MARC 21 Concise Formats.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 an invalid classification number to a valid or partially valid number. In the MARC 21 classification format, only one Invalid Number Tracing field is currently defined.