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MARC 21 Concise Classification: Valid Number Tracing Fields (5XX)
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.
Information for Translators and Other Users
Items highlighted in red indicate changes made after
the 2003 edition of the MARC 21 Concise Formats was published and are
included
in the 2004 printed edition
of the MARC 21 Concise Formats.

