This letterbook covers the period June-July 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. Included are letters about the water-motor phonograph, the promotion of the phonograph in Europe, China, Japan, and Mexico, and the exhibition of the talking doll at the Minneapolis Industrial Exposition. Other letters pertain to electric lighting, mining and ore milling, and electric traction systems. The book contains 500 numbered pages and an index. Approximately 30 percent of the book has been selected.