Columbia subject headings:
Harvard subject headings:
Angola--Commerce--History.
Angola--Economic conditions
Angola--Economic policy.
Portugal--Colonies--Commerce--History.
Slave trade--Angola--History.
Princeton subject headings:
Angola--Commerce--History--18th century.
Angola--Commerce--History--19th century.
Slave trade--Angola--History--18th century.
Slave trade--Angola--History--19th century.