Columbia subject headings:
Africa--Discovery and exploration--Portuguese.
America--Discovery and exploration--Portuguese.
Asia--Discovery and exploration--Portuguese.
Portugal--History--Period of discoveries, 1385-1580.
Harvard subject headings:
Africa--Discovery and exploration--Portuguese.
America--Discovery and exploration--Portuguese.
Asia--Discovery and exploration--Portuguese.
Portugal--History--Period of discoveries, 1385-1580.
Princeton subject headings:
Portugal--Foreign relations--History.
Portugal--History--Period of discoveries, 1385-1580.