This letterbook covers the period December 1889-January 1890. 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. There is also correspondence regarding ore milling, the purchase of mining properties, the mimeograph, and the phonoplex system. Several of the letters pertain to the use of batteries with the phonograph and phonoplex. Some of the documents deal with the payment of Edison's taxes and other personal and financial matters. Included also are letters to the firm of Dyer & Seely about foreign and domestic patents. The front cover is labeled "Indexed General Letter Book T. A. Edison Orange N.J." The book contains 500 numbered pages and an index. Approximately 40 percent of the book has been selected.