Columbia subject headings:
Colorado--Description and travel.
Frémont, John Charles, 1813-1890--Travel--West (U.S.)
Moffat, Gwen--Travel--West (U.S.)
Overland journeys to the Pacific.
United States--Discovery and exploration.
West (U.S.)--Description and travel.
Harvard subject headings:
Discoveries in geography--American.
Frémont, John Charles, 1813-1890--Travel--West (U.S.)
Moffat, Gwen--Travel--West (U. S.)
Overland journeys to the Pacific.
Rocky Mountains--Description and travel.
Princeton subject headings:
Frémont, John Charles, 1813-1890.
Rocky Mountains--Description and travel.
Southwestern States--Description and travel.
West (U.S.)--Description and travel.