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
Introduction to Handbook of American Indian Languages and Indian Linguistic Families of America North of Mexico
Franz Boas