Columbia subject headings:
Africa, Sub-Saharan--Politics and government.
Africa--History--To 1498.
Europe--History--476-1492.
Europe--History--To 476.
Europe--Politics and government.
Social structure--Africa, Sub-Saharan--History.
Harvard subject headings:
Africa, Sub-Saharan--Politics and government.
Africa--History--To 1498.
Europe--History--476-1492.
Europe--Politics and government.
Social structure--Africa, Sub-Saharan--History.
Social structure--Europe--History.
Princeton subject headings: