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The Trans-Mississippi West 1803-1853 : a history of its acquisition and settlement
Goodwin, Cardinal Leonidas, (1967)
The transportation frontier : Trans-Mississippi West 1865 - 1890
Winther, Oscar Osburn, (1964)
Vanguards of the frontier : a social history of the Northern Plains and Rocky Mountains from the fur traders to the sod busters
Dick, Everett Newfon, (1941)
The Southern frontier
Caruso, John Anthony, (1963)