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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.

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Correspondence (1902)

This folder contains correspondence and other documents relating to mining surveys in Connecticut and the Sudbury district of Ontario. Included are letters from Edison associates Walter S. Mallory and John F. Ott. Other correspondents include attorney John T. Hubbard of Litchfield, Connecticut; Henry Ranger, a prospector; and T. J. Ryan, a Department of Crown Lands agent. The letters concern the procurement of mining rights and land leases; maps, equipment, and instruments; and prospecting services, ore samples, and assays. Several letters pertain to the acquisition and use of a magnetic dipping needle and a diamond drill. Also included are items relating to the hiring of students from Yale University for prospecting work. Additional letters from Edison's brother-in-law, Ira Miller, concern the Miller family's business and other matters.

Log of Camp Edison (1902)

This book covers the period July-October 1902. It deals mainly with the leisure and recreation activities of the prospecting party in the Sudbury district of Ontario,whose participants included John V. Miller, Edward B. Miller, R. Howard Embree, Claude Opdyke, and Herbert Sandler. The cover is stamped "Log of Camp Edison Ontario Canada."

Correspondence (1905- 1906)

This folder contains correspondence relating to the administration of land titles and the transmittal of documents. Most of the letters are by Charles McCrea, a solicitor in Sudbury, Ontario. There is also one item by Edison's brother- in-law, Lewis A. Miller.

Correspondence (1907)

This folder contains correspondence and other documents relating to the rental and transfer of mining leases.

Correspondence (1910- 1924)

This folder covers the periods 1910-1919 and 1924. It contains correspondence and other documents pertaining to the administration of mining properties in the Sudbury and Nipissing districts of Ontario. The letters are to or from John V. Miller; some bear marginalia by Charles Edison. The documents deal mainly with taxes and leases relating to the Darby Mine and property holdings in Blezard township, Ontario. Included are items concerning the sale of machinery; attempts to sell or option the properties; and the administration of the Darby Mine Investment Account by the Edison Storage Battery Co.

Correspondence (1931- 1952)

This folder contains correspondence, agreements, and other documents relating to mining properties in the Sudbury and Nipissing districts of Ontario. Most of the correspondence is to or from John V. Miller, secretary of Edison's estate. Included is a management-transfer agreement of 1936 between Charles Edison and Thomas A. Edison, Inc., relating to mining properties in Blezard township, Ontario. Several documents pertain to the International Nickel Co. of Canada, Ltd., and its properties in Blezard township. Some of the material from 1937 and 1938 concerns the transfer of the Darby Mine to Thomas A. Edison of Canada, Ltd., a subsidiary of Thomas A. Edison, Inc. There is also a copy of Edison's last will and testament.