John Wesley Powell
March 24, 1834 – September 23, 1902
Průzkum řeky Colorado a jejích kaňonů : zpráva majora J.W. Powella, Washington 1895
John Wesley Powell
Exploration of the Colorado River of the West and Its Tributaries: Explored in 1869, 1870, 1871, and 1872, Under the Direction of the Secretary of the
John Wesley Powell
