Down the Colorado diary of the first trip through the Grand Canyon, 1869 /
Powell, John Wesley,1834-1902.
Porter, Eliot,1901-1990.
Fowler, Don D.
London Allen & Unwin
1969
Originally published in 'Exploration of the Colorado River of the West and its tributaries, explored in 1869, 1870, 1871 and 1872'. Washington: Smithsonian Institute, 1875