This letterbook covers the period July-August 1878. It consists of letters by James Redpath, manager of the company's exhibition agencies, addressed to exhibitors and prospective exhibitors throughout the United States and Canada. The correspondence pertains to the assignment of phonograph exhibitors and improvements in various phonograph models. The front cover is marked "Phonograph Agency" and "1878." The spine is marked "4." The book contains 500 numbered pages and an index. Approximately 10 percent of the letters have been selected.