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These documents cover the period 1901-1952, with most of the material dating from 1902-1904. Included are correspondence, reports, legal documents, equipment inventories, and other items relating primarily to the administration of mining surveys and properties in Ontario. Most of the letters are to or from John V. Miller. Other correspondents include Edison; Walter S. Mallory, vice president of MECNJ; John F. Randolph, secretary- treasurer; George Hetherington and Robert Rafn of the West Orange laboratory; and attorneys John T. Hubbard and Frank Denton. There are also letters from property owners, prospective buyers of Edison's Canadian property, and agents of the Department of Crown Lands in Ontario.
Included are documents pertaining to drilling operations, mining rights, and land leases, along with others dealing with expenses, equipment, and taxes. Several letters concern the acquisition and use of a magnetic dipping needle and a diamond drill. The material from the period after 1904 relates mainly to efforts to sell or option Edison's properties; Miller later conducted these activities on behalf of Edison's estate.