Columbia subject headings:
Harvard subject headings:
Colorado River (Colo.-Mexico)
Colorado--Description and travel.
Explorers--Anecdotes--1840-1870.
North America -- Colorado River.
Powell, John Wesley, 1834-1902
United States
White, James, 1837-
White, James, 1837-1927.
Princeton subject headings:
Colorado River (Colo.-Mexico)
White, James, 1837-