Title: Down the great unknown : John Wesley Powell's 1869 journey of discovery and tragedy through the Grand Canyon /
Authors: Dolnick, Edward, 1952-
Publisher: HarperCollins,
Year: 2001
Subjects: Powell, John Wesley, Journeys Arizona Grand Canyon.; Explorers United States Biography; Grand Canyon (Ariz.) Discovery and exploration.; Grand Canyon (Ariz.) Description and travel.; Colorado River (Colo.-Mexico) Discovery and exploration.