This letterbook covers the period September-October l890. Most of the correspondence is by Edison and Alfred O. Tate. Many of the letters relate to the manufacture and marketing of the phonograph and talking doll. Included are numerous letters pertaining to the business of the Edison Phonograph Works, the Edison Phonograph Toy Manufacturing Co., the Edison United Phonograph Co., and the Automatic Phonograph Exhibition Co. There are also documents relating to mining and ore milling, the design of an alternating current multipolar dynamo, a new motor for use on electric railways, and the presentation of phonographs to European heads of state. Beginning on page 247 is a four-page memorandum regarding the status of approximately one hundred Edison patents. The front cover is labeled "1890 General Letter Book Indexed Sept 10, 1890-Oct 20, 1890." The book contains 500 numbered pages and an index. Approximately 25 percent of the book has been selected.