Columbia subject headings:
Harvard subject headings:
British Columbia--History.
Fur trade--British Columbia--History--19th century.
Princeton subject headings:
British Columbia--History--Sources.
Explorers--Canada--Biography.
Fortification--British Columbia--History.
Fur trade--British Columbia--History--19th century--Sources.
Fur traders' writings.
Fur traders--Canada--Biography.
Thompson, David, 1770-1857.