Columbia subject headings:
Fur trade--Political aspects--Soviet Union--History.
Fur trade--Soviet Union--History.
Russia--Politics and government--To 1533.
Harvard subject headings:
Fur trade--Political aspects--Soviet Union--History.
Fur trade--Soviet Union--History.
Russia--Politics and government--To 1533.
Princeton subject headings:
Fur trade--Political aspects--Russia--History.
Fur trade--Russia--History.
Russia--Politics and government--To 1533.