NACO: 5xx Fields
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Princeton University Cataloging Documentation

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5xx fields

5xx references show special relationships between two or more AACR2 headings, which are connected by "see also" references. Pseudonyms for the same individual, and different names for the same corporate body, which result from name changes, are connected in this way.

For more details and examples, see: 5xx references in the section on Cross References.