Columbia subject headings:
Crusades--Congresses.
Europe--Relations--Islamic Empire--Congresses.
Islamic Empire--Relations--Europe--Congresses.
Latin Orient--Congresses.
Harvard subject headings:
Crusades--Congresses
Europe--Relations--Islamic Empire--Congresses.
Islamic Empire--Relations--Europe--Congresses.
Latin Orient--Congresses.
Palestine--History
Princeton subject headings:
Crusades--Congresses.
Europe--Relations--Islamic Empire--Congresses.
Islamic Empire--Relations--Europe--Congresses.
Latin Orient--Congresses.