This letterbook, which covers the period September 1889-June 1890, deals with the business of the Edison Iron Concentrating Co., incorporated in Illinois in 1889. The company erected an ore milling works in Humboldt, Michigan, employing Edison's ore milling technologies with royalties being paid to Edison. Investors included Mallory; Edison's father-in-law, Lewis Miller; and Miller's son, Ira. All of the letters are written by Mallory, secretary and treasurer of the company. The documents deal mainly with personnel, surveys and leases of mining properties, stock transactions, tax and insurance matters, equipment, and supplies. Other letters relate to the procurement of ore samples for the West Orange laboratory, operations at the Humboldt works, and Mallory's private affairs. A few items pertain to the talking doll. The front cover is labeled "E. I. C. Co." The spine is labeled "W. Mallory Sept. 19, 1889-June 19, 1890." The book contains 670 numbered pages and an index (not selected). Approximately 5 percent of the documents have been selected. The unselected material consists of routine correspondence and letters duplicated in other series. Many of the letters are written in very faint green or blue ink and may be difficult to read.