This letterbook covers the period June 1900-April 1901. Most of the correspondence is by Edison and John F. Randolph. There are also letters by Cloyd M. Chapman, Walter S. Mallory, and others. The letters relate to the shutdown of Edison's iron ore concentration plant at Ogden, New Jersey; the planning and construction of his cement plant at Stewartsville, New Jersey; gold mining and ore concentration operations at the Ortiz mine in Santa Fe, New Mexico; and the erection of an iron ore concentration plant in the Dunderland region of Norway, in connection with the Edison Ore Milling Syndicate, Ltd. Also included are other items pertaining to Edison's interest in ore milling, mines, and ores, as well as letters regarding the domestic and foreign phonograph business, Edison's plans for his storage battery, orders for equipment and supplies, and family and other personal matters.

The label on the front cover contains the following notation: "Letter Book of Thomas A. Edison Personal. From June 8 - 1900 To Apr 11 - 1901. Indexed." The book contains 500 numbered pages and an index. Approximately 20 percent of the book has been selected.