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1
History
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1Published 1949Washington [D.C.] : National Archives, 1949.29 microfilm reels ; 35 mm.“...Letters sent by the U.S. Geological Survey, 1879-1895....”
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2Published 1964Washington : National Archives and Records Service, General Services Administration, 1964.118 microfilm reels ; 35 mm. + 1 guide (8 p.)“...Letters received by the U.S. Geological Survey, 1879-1901....”
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3Published 1949Washington, D.C. : National Archives, 1949.16 microfilm reels ; 35 mm.“...Registers of letters received by the U.S. Geological Survey, 1879-1901....”