Columbia subject headings:
Harvard subject headings:
Ferris, Warren Angus, 1810-1873.
Fur trade--Rocky Mountains--History--19th century.
Fur trade--West (U.S.)--History--19th century.
Rocky Mountains--Description and travel.
West (U.S.)--Description and travel.
Yellowstone National Park.
Princeton subject headings:
Ferris, Warren Angus, 1810-1873.
Fur trade--Rocky Mountains--History--19th century.
Fur trade--West (U.S.)--History--19th century.
Rocky Mountains--Description and travel.
West (U.S.)--Description and travel.
Yellowstone National Park.