This letterbook covers the period April-May 1890. Most of the letters are by Alfred O. Tate. There is also correspondence by Edison and John F. Randolph. Many of the letters relate to the manufacture and marketing of the phonograph and talking doll. Some of the correspondence concerns the promotion of the phonograph in Europe, Asia, and South America and the establishment of a company to sell talking dolls in Europe. Other letters pertain to mining and ore milling, electric lighting, and the Edison-Lalande battery. There is also correspondence about the 1890 Women's Exhibition in New York and the payment of the experimental accounts of the West Orange laboratory. Beginning on page 188 is a seven-page memorandum about experiments conducted at the laboratory for various Edison companies. The book contains 500 numbered pages and an index. Approximately 40 percent of the book has been selected. Courtesy of Thomas Edison National Historical Park.