This letterbook covers the periods June 1887-January 1888 and August-November 1888. Many of the letters are by Edison. There is also correspondence by Alfred O. Tate and John F. Randolph. Included are letters relating to phonograph patent applications in the United Kingdom, electric light patents in France and Germany, and the marketing of the electric light in Asia. Other letters pertain to the ore separator and to the Edison phonoplex system. Included also are letters to Samuel Insull about the proper manner of representing Edison as a surrogate and correspondence with A. B. Dick regarding an electric pen agreement. The front cover is marked "188[7?]" and is labeled "General Letters." The spine is stamped "Letters." The book contains 498 numbered pages and an index. There are also numerous groups of unnumbered pages inserted into the book between the numbered pages. Approximately 30 percent of the book has been selected. Courtesy of Thomas Edison National Historical Park.