Carlos Schwantes is St. Louis Mercantile Library Endowed Professor of Transportation Studies at the University of Missouri-St. Louis, specializing in the history of the twentieth-century American West. He is author of Going Places: Transportation Redefines the Twentieth-Century West and Railroad Signatures across the Pacific Northwest. James P. Ronda holds the H. G. Barnard Chair in Western American History at the University of Tulsa, specializing in the history of exploration of the American West. He is the author of Beyond Lewis and Clark: The Army Explores the West and Jefferson's West: A Journey with Lewis and Clark.