After Hammersley resigned from the University of New Mexico in 1971, he supported himself financially by selling his artwork. This series documents Hammersley's diligent efforts to promote his art through exhibitions and sales. Also contained in this series are tax returns, price lists, and receipts for living expenses and art supplies. The gallery and museum records include correspondence, expense ledgers, consignment agreements, art transport records, invoices and receipts, and insurance records. Hammersley had a decades long relationship with several galleries, including Modernism Gallery (San Francisco), L.A. Louver Gallery (Venice, California), and Hoshour Gallery (Albuquerque). The acceptance and rejection notices contain a compilation of material that documents Hammerlsey submissions to art shows and exhibitions.

Also found are personal financial and business records from Anna and Harold Hammersley's household including 10 household income journals, deeds, insurance records, receipts, retirement information, stocks, and tax records.

Materials are arranged by document type with individual business contacts interfiled alphabetically. Financial records for family members are filed at the end of the series.

This series has been partially scanned. Materials containing sensitive information have not been scanned. These include banking records, passport applications, retirement records, and tax documents.