Plains in '65_ (Denver, 1905); Samuel Bowles, _Across the Continent_ (Springfield, 1861); Samuel Bowles, _Our New West, Records of Travels between the Mississippi River and the Pacific Ocean_ (Hartford, 1869); W. A. Bell, _New Tracks in North America_ (2d ed., London, 1870); J. H. Beadle, _The Undeveloped West, or Five Years in the Territories_ (Phila., 1873). The classic account of traffic on the plains is Josiah Gregg, _Commerce of the Prairies, or the Journal of a Santa Fé Trader_ (many editions, and reprinted in Thwaites); H. M. Chittenden, _History of Steamboat Navigation on the Missouri River_ (N.Y., 1903), and _The American Fur Trade of the Far West_ (N.Y., 1902), are the best modern accounts. A brilliant sketch is C. F. Lummis, _Pioneer Transportation in America, Its Curiosities and Romance_ (_McClure's Magazine_, 1905). Other works of use are Henry Inman, _The Old Santa Fé Trail_ (N.Y., 1898); Henry Inman and William F. Cody, _The Great Salt Lake Trail_ (N.Y., 1898); F. A. Root and W. E. Connelley, _The Overland Stage to California_ (Topeka, 1901); F. G. Young, _The Oregon Trail_, in _Oregon Hist. Soc. Quarterly_, Vol. I; F. Parkman, _The Oregon Trail_. Railway transportation in the Far West yet awaits its historian. Some useful antiquarian data are to be found in C. F. Carter, _When Railroads were New_ (N.Y., 1909), and there are a few histories of single roads, the most valuable being J. P. Davis, _The Union Pacific Railway_ (Chicago, 1894), and E. V. Smalley, _History of the Northern Pacific Railroad_ (N.Y., 1883). L. H. Haney, _A Congressional History of Railways in the United States to 1850_; J. B. Sanborn, _Congressional Grants of Lands in Aid of Railways_, and B. H. Meyer, _The Northern Securities Case_, all in the _Bulletins_ of the University of Wisconsin, contain much information and useful bibliographies. The local historical societies have published many brief articles on single lines. There is a bibliography of the continental railways in F. L. Paxson, _The Pacific Railroads and the Disappearance of the Frontier in America_, in _Ann. Rep. of the Am. Hist. Assn._, 1907. Their social and political aspects may be traced in J. B. Crawford, _The Crédit Mobilier of America_ (Boston, 1880) and E. W. Martin, _History of the Granger Movement_ (1874). The sources, which are as yet uncollected, are largely in the government documents and the files of the economic and railroad periodicals.