[12]Homer C. Hockett, _Political and Social Growth of the United States 1492-1852_ (New York: Macmillan Co., 1933), p. 368. [13]_Ibid._, p. 369. [14]_Ibid._, p. 371. [15]Fridtjof Nansen, “The Norsemen in America,” _The Geographical Journal_, XXXVIII, 6 (Dec. 1911), 558. [16]Reuben G. Thwaites, _Original Journals of the Lewis and Clark Expedition 1804-1806_ (New York: Dodd Mead and Co., 1905), p. 262. Clark reached Yellowstone River on July 15, 1806. [17]Francis Antoine Larocque, _Journal_ (Sources of Northwest History No. 20, University of Montana), p. 20. Dee Linford says the name Yellowstone was used by David Thompson in 1798, but that Americans did not learn about the river until about 1805. See “Wyoming Stream Names,” _Annals of Wyoming_, XV, 3 (July, 1943), 269. [18]Patrick Gass, _Journal_ (Chicago: A. C. McClurg, 1904), p. 253. In 1832 a steamboat named the “Yellowstone” arrived at Fort Union. [19]P. Koch, “Discovery of Yellowstone National Park,” _Magazine of American History_, II (June, 1884), 498. [20]Just how far Coronado penetrated the Rockies is a disputed point. It is certain that Verendrye reached Pierre, South Dakota. Some contend that he came as far as the Little Bighorn River. It is probable that some of Henry’s men were free trappers, which accounts for the fact that they split in groups when the fort was abandoned. [21]Others to participate in this discovery were Milton Mangum, Clifford Mangum, John T. Elliott, Budge Elliott, William Thornock, and David Beal. [22]Robert Stuart, _The Discovery of the Oregon Trail_ (New York: Charles Scribner’s Sons, 1935), p. CXXXVI. Etienne Provot and Thomas Fitzpatrick have both been credited with the discovery of South Pass. Certainly the latter’s visit in 1824 marks the date of effective discovery. [23]W. J. Ghent, “A Sketch of John Colter,” _Wyoming Annals_, X, 3 (July, 1938). [24]Stallo Vinton, _John Colter, Discoverer of Yellowstone Park_ (New York: Edward Eberstadt, 1926), p. 27. [25]W. J. Ghent, _op. cit._ The copious journals of Lewis, Clark and Sergeant Ordway make repeated mention of Colter, and Whitehouse names him six times. Floyd does not mention him by name nor does Gass, although the latter refers to him specifically. [26]Reuben G. Thwaites, _op. cit._, V, 314. [27]Stallo Vinton, _op. cit._, p. 24. [28]_Ibid._, p. 43. Colter’s strange behavior in turning back to the wilderness after three successive starts toward home, is analyzed by C. H. Heffelfinger in his article, “The Man Who Turned Back,” _The Washington Historical Quarterly_, XXVI, 3 (July, 1935). [29]_Ibid._, p. 45. Lisa had a son named “Remon” for whom the fort was named, but different documents bear the name Raymond, Manuel, and Lisa.