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Report of the Geological exploration of the fortieth parallel made by order of the Secretary of War according to the acts of Congress of March 2 1867 and March 3 1869under the direction of A A Humphreys chief of engineersConference Proceeding Bookمنشور في 1870
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حسب Pollock, Adelaide Lowry
منشور في 1925 -
حسب Larrison, Earl J. (Earl Junior), 1919-1987
منشور في 1981 -
منشور في 1918