Columbia subject headings:
Fortification, Portuguese--Morocco--History.
Military architecture--Morocco--History.
Morocco--History.
Portugal--History.
Portuguese--Morocco--History.
Harvard subject headings:
Fortification, Portuguese--Morocco--History.
Military architecture--Morocco--History.
Morocco--History.
Portugal--History.
Portuguese--Morocco--History.
Princeton subject headings:
Fortification, Portuguese--Morocco--History.
Military architecture--Morocco--History.
Morocco--History.
Portugal--History.
Portuguese--Morocco--History.