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6.1. Duplicate Records and Merging

Last Updated 10/29/2024

Merging Scenarios

There are three scenarios that could require merging:

1. You are cataloging a new version of an item with an existing record and need to include information for your current version in the record.
2. An existing record needs to be improved.
3. Multiple records for the same materials exist in the catalog.

If the existing record needs to be improved or multiple records already exist in the catalog for the exact same materials or materials with the same content, but with a different publisher or distributor, a bibliographic cataloger should carefully evaluate the record before making changes or merging the duplicate records.

Guidelines for determining when to merge

1. Do not choose a lead record that does not have an OCLC number.
2. If two records have two different OCLC numbers but are discerned to be a good match in most or all other respects, merge the records and append all OCLC numbers from both the lead and sub bibs onto the final, merged bib.
3. If one record has an OCLC number and the second does not, and the ISBNs, titles, and editions match, merge the records.
4. If none of the records have an OCLC number, choose the best as the lead and merge.
5. If the records have the same OCLC number, choose the best as the lead and merge.

NOTE: Make sure you clean up the resulting merged record to comply with current NC Cardinal Best Practices.