The collection consists predominantly of correspondence by between salesmen in the field and the management of the Keystone View Company from 1903-1906, 1908.

Most of the letters are written to and from Walter W. Barnhart and include information on customers and accounts, new products, and company business. The collection also contains a single folder of blank order forms (referenced in some of the correspondence), purchase receipts, and two of Barnhart's draft cards (1918).