On the call slip for archival collections you will need to supply the Yale Record Group number and, for recently processed or newly accessioned material, the Record Unit number. These will be found in the online record and at the beginning of the inventory for the records.

The accession number, accession date, and series number should be included if noted on the inventory.

Because we retrieve archival material by box, researchers must be careful to use the box number rather than the folder number on the call slip.