Columbia subject headings:
Castles--Ghana--History.
Fortification--Ghana--History.
Ghana--History--To 1957.
Historic sites--Ghana.
Harvard subject headings:
Castles--Ghana--History.
Fortification--Ghana--History.
Ghana--History--To 1957.
Historic sites--Ghana
Princeton subject headings:
Castles--Ghana--History.
Fortification--Ghana--History.
Ghana--History--To 1957.
Historic sites--Ghana.