Columbia subject headings:
Harvard subject headings:
Africa--Economic conditions.
Africa--History.
Africa--Population.
Africa--Relations--Europe.
Africa--Social conditions.
Europe--Economic conditions.
Europe--History.
Europe--Population.
Europe--Relations--Africa.
Europe--Social conditions.
Princeton subject headings:
Africa--Economic conditions.
Africa--History.
Africa--Population.
Africa--Relations--Europe.
Africa--Social conditions.
Europe--Economic conditions.
Europe--History.
Europe--Population.
Europe--Relations--Africa.
Europe--Social conditions.