This letterbook covers the period May-June 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. Other letters pertain to mining and ore milling, electric lighting, the phonoplex system, the Edison-Lalande battery, and electric traction systems. Included also are letters to various Edison companies regarding bills for experiments conducted at the West Orange laboratory. There is some material relating to Edison's personal finances, including a list of bonds bought through Drexel, Morgan, & Co. The cover is marked "General Book T.A. Edison." The book contains 498 numbered pages and an index. Approximately 40 percent of the book has been selected. Courtesy of Thomas Edison National Historical Park.