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Governor of Michigan, writer, businessman; papers include correspondence, business records, speeches, writings, visual materials, diaries.

The Osborn collection consists of correspondence, diaries, business papers, scrapbooks, photographs, and other materials accumulated during his life. Materials prior to 1889 are scarce possibly because of a fire which destroyed Osborn's home; thereafter and up to the time of his death in 1949, the Osborn papers are voluminous, documenting each of this man's varied activities. Although his career as elected public official was limited to one term as governor, the collection reflects the importance of his life in areas beyond politics alone. His voice was heard, in letters and speeches and monographs, speaking out on the issues of the day - prohibition, conservation, the New Deal, and of course his life-long interest in the development of Michigan's Upper Peninsula economy and natural resources.

Chicago, Illinois engineer. Personal and business papers, notes, reports, and correspondence, much of it with his brother Mortimer E. Cooley and Chase S. Osborn; include material concerning the Cooley family genealogy, water engineering projects, the Hudson Bay Co., 1850-1908, the St. Lawrence Seaway, and Mortimer E. Cooley's race for the U.S. Senate in 1924.

The Ernest L. Cooley papers consist of correspondence, engineering reports and notes, and Cooley family genealogical material. Included is an extensive exchange of correspondence with his brother Mortimer E. Cooley, dean of the Engineering School of The University of Michigan. These letters concern vacation plans for trips to northern Michigan and Canada, and Mortimer Cooley's candidacy for the U.S. Senate from Michigan in 1924 (especially correspondence, July 1924 to Jan. 1925). There is also material relating to the management of the Cooley farm in Georgia 1927; the controversy surrounding the falling level of the Great Lakes (i.e., Nov. 18, 1926); and other engineering projects.

Another of his correspondents was Chase S. Osborn, former governor of Michigan. These letters cover personal matters growing out of their retreats to Osborn's summer camp at Duck Island. There is also material relating to the proposed St. Lawrence Waterways in letters of Aug. 1927 and throughout. Other than correspondence, the collection includes reports made on hydraulic engineering projects, particularly relating to flood control in the Chicago area, and the diversion of the Des Plaines River. Cooley also collected material relating to the history of the Hudson Bay Company. There are several folders of original business correspondence, reports, and accounts of the Hudson's Bay Company, 1850-1908. Miscellaneous items of interest include Cooley family genealogy found particularly in correspondence of 1915-1916. Cooley also wrote a short autobiographical sketch, Dec. 30, 1920; there is also a note on William Randolph Hearst, June 20, 1912.

Saginaw, Michigan, lumberman and businessman, and Michigan State Tax Commissioner, 1912 and wildlife conservationist and sportsman. Papers include extensive correspondence files, business records and photographs.

The William Mershon collection consists of correspondence dealing with Mershon's various activities as a lumberman, Saginaw businessman, and member of the State Tax Commission in 1912. Subjects included in the papers are Michigan wildlife conservation, the Michigan Sportsmen Association, the Michigan Manufacturers Association, the Michigan State Tax Commission, Michigan politics, the Democratic party, personal business investments, lumbering and mining interest, and personal affairs.

The collection also includes diaries, a book of notes on hunting and fishing trips, and various business records such as cash books, time books, ledgers, and journals. These primarily concern his investments and lumbering business. Many of the business records are available on microfilm. The collection also includes photographs.