This letterbook covers the period June-August 1915. Most of the correspondence is by Edison and William H. Meadowcroft. Many items pertain to Edison’s benzol absorbing plants and business conditions during World War I. There are also documents regarding Edison’s election as a vice president of the American Peace and Arbitration League, his endorsement of government-sponsored research at the Massachusetts Institute of Technology, and his opinions about the war. Additional correspondence relates to the technical and commercial development of phonographs and recordings. The correspondents include longtime Edison associate Samuel Insull; businessmen Richard M. Colgate and Farnham Yardley, who were Edison's neighbors in Llewellyn Park; and representatives of Mitsui & Co., an investor in Edison’s benzol businesses.
The spine is stamped "Letters" and is marked "T.A.E. From June 18- 1915 August- 4-1915." The number "43" also appears on the spine. The book contains 699 numbered pages and an index. Approximately 15 percent of the book has been selected. Courtesy of Thomas Edison National Historical Park.