Columbia subject headings:
Harvard subject headings:
Frontier and pioneer life--West (U.S.)
Fur trade--West (U.S.)--History--19th century.
Pioneers--West (U.S.)--Biography
Walker, Joseph Rutherford, 1798-1876.
West (U.S.)--Biography.
Princeton subject headings:
Frontier and pioneer life--West (U.S.)
Fur trade--West (U.S.)--History--19th century.
Pioneers--West (U.S.)--Biography.
Walker, Joseph Rutherford, 1798-1876.
West (U.S.)--Biography.