Columbia subject headings:
Harvard subject headings:
America--Discovery and exploration--Portuguese--Congresses.
America--Discovery and exploration--Spanish--Congresses.
Demarcation line of Alexander VI--Congresses.
Portugal. Treaties, etc. 1494 June 7--Congresses.
Princeton subject headings:
Portugal--History--Period of discoveries, 1385-1580--Congresses.
Portugal--Relations--Spain--Congresses.
Portugal. Treaties, etc. 1494 June 7--Congresses.
Spain--History--711-1516--Congresses.
Spain--History--Ferdinand and Isabella, 1479-1516--Congresses.
Spain--Relations--Portugal--Congresses.