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These documents cover the period 1900-1916, with most of the material dating from 1901-1908. Included are notes and drawings in Edison's hand, correspondence addressed to Edison, and prospecting reports. The documents relate to nickel and cobalt mines, ore samples and purchases, and property rights. Much of the correspondence pertains to the administration of Edison's mining properties in the Sudbury and Nipissing districts of Ontario, but there are also letters concerning property in Oregon, Connecticut, and elsewhere. A few items relate to Edison's interest in magnetic surveying and to a request from the U.S. Geological Survey for a hand-held magnetic separator. There is also an undated report by an unidentified author concerning the international nickel industry. The letters are mainly by Edison's representatives, including his brother-in-law, John V. Miller; Walter S. Mallory, vice president of MECNJ; and John F. Randolph, secretary-treasurer. Additional correspondents include mining engineer and Edison employee Cloyd M. Chapman; attorney John T. Hubbard of Litchfield, Connecticut; and Horace M. Wilson, mining scout and manager of the Darby Mine. Many of the letters bear Edison marginalia.