George, Engelmann On The Geology And Natural History Of The Upper Missouri ?being The Substance Of A Report Made To Lieut. G.k. Warren, T.e. U.s.a. /by Dr. F.v. Hayden
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On The Geology And Natural History Of The Upper Missouri ?being The Substance Of A Report Made To Lieut. G.k. Warren, T.e. U.s.a. /by Dr. F.v. Hayden