This letterbook covers the period August-September 1915. Most of the correspondence is by Edison and William H. Meadowcroft. Many items pertain to Edison's benzol absorbing plants and other chemical manufacturing interests and to business conditions during World War I. A few documents concern his sale of toluol to the British government. Additional correspondence relates to the technical and commercial development of phonographs and recordings. There are also references to Edison's cement and storage battery businesses. The correspondents include motion picture executive J. Stuart Blackton, storage battery investor Arthur I. Clymer, and publisher and longtime Edison associate Richard R. Bowker.

The spine is stamped "Letters" and is marked "T.A.E. from Aug 4 1915 To Sept 25 1915." The number "44" also appears on the spine. The book contains 700 numbered pages and an index. Approximately 10 percent of the book has been selected.