Columbia subject headings:
Harvard subject headings:
Asia--Relations--Portugal.
Asia--Relations--Spain--Castile.
Castile (Spain)--Relations--Asia.
Castile (Spain)--Relations--Portugal.
Portugal--Relations--Asia.
Portugal--Relations--Spain--Castile.
Princeton subject headings:
Asia--Relations--Portugal.
Asia--Relations--Spain--Castile.
Castile (Spain)--Relations--Asia.
Castile (Spain)--Relations--Portugal.
Portugal--Relations--Asia.
Portugal--Relations--Spain--Castile.