Columbia subject headings:
Portugal--Colonies--History.
Portugal--Foreign relations.
Portugal--History, Military.
Portugal--Military policy.
Harvard subject headings:
Portugal--Colonies--History.
Portugal--Foreign relations.
Portugal--History, Military.
Portugal--Military policy--History.
Princeton subject headings:
Portugal--Colonies--History.
Portugal--Foreign relations.
Portugal--History, Military.
Portugal--Military policy--History.