Columbia subject headings:
Harvard subject headings:
India--Relations--Portugal--Congresses.
Portugal--Colonies--Asia--History--Congresses.
Portugal--Relations--India--Congresses.
Portuguese--India--History--Congresses.
Princeton subject headings:
India--Relations--Portugal--Congresses.
Portugal--Colonies--Asia--History--Congresses.
Portugal--Relations--India--Congresses.
Portuguese--India--History--Congresses.