* Unruh, John D., Jr. ''The Plains Across: The Overland Emigrants and the Trans-Mississippi West, 1840-1860.'' (1979). 565 pp. standard scholarly history | * Unruh, John D., Jr. ''The Plains Across: The Overland Emigrants and the Trans-Mississippi West, 1840-1860.'' (1979). 565 pp. standard scholarly history |