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This information is found in 028 and 500 fields. The music number on the item MUST match one music number on the record. If there are multiple numbers on the record or the item, there only needs to be one match. However, be careful with set numbers. Check the rest of the record to make sure it is for the single record and not for the entire set.
All CDs go to Ping for call numbers??? Different once we switch to accession numbers?