Account of an expedition from Pittsburgh to the Rocky Mountains :
performed in the years 1818, 1920 by order of the Hon. J.C. Calhoun, Secretary of War, under the command of Maj. S.H. Long, of the U.S. top engineers : compiled from the notes of Major Long, Mr. T. Say, and other gentleman of the party /
by Edwin James, botanist and geologist to the expedition ; edited with notes, introductions, index, etc. by Reuben Gold Thwaites, LL.D.

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