Columbia subject headings:
Harvard subject headings:
Explorers--West (U.S.)--Biography
Frontier and pioneer life in literature.
Frontier and pioneer life--West (U.S.)
Fur trade--West (U.S.)--History.
Mountain life in literature.
Trappers in literature.
Trappers--West (U.S.)--Biography
West (U.S.)--Discovery and exploration.
Princeton subject headings:
Explorers--West (U.S.)--Biography.
Frontier and pioneer life in literature.
Frontier and pioneer life--West (U.S.)
Fur trade--West (U.S.)--History.
Mountain life in literature.
Trappers in literature.
Trappers--West (U.S.)--Biography.
West (U.S.)--Discovery and exploration.