Columbia subject headings:
Harvard subject headings:
Christianity and other religions--Islam--History--Congresses.
Christians--Portugal--History--Congresses.
Christians--Spain--History--Congresses.
Islam--Relations--Christianity--History--Congresses.
Muslims in literature--Congresses.
Muslims--Portugal--History--Congresses.
Muslims--Spain--History--Congresses.
Portugal--Civilization--To 1500--Congresses.
Spain--Civilization--711-1516--Congresses.
Princeton subject headings:
Christianity and other religions--Islam--History--Congresses.
Christians--Portugal--History--Congresses.
Christians--Spain--History--Congresses.
Islam--Relations--Christianity--History--Congresses.
Muslims in literature--Congresses.
Muslims--Portugal--History--Congresses.
Muslims--Spain--History--Congresses.
Portugal--Civilization--To 1500--Congresses.
Spain--Civilization--711-1516--Congresses.