Columbia subject headings:
Architecture, Medieval--Europe--Congresses.
Art, Medieval--Europe--Congresses.
Civilization, Medieval--Congresses.
Crusades--Congresses.
Europe--History--476-1492--Congresses.
Harvard subject headings:
Architecture, Medieval--Europe--Congresses.
Crusades--History--Congresses.
Crusades--Third, 1189-1192--Logistics--Congresses.
Imports--Europe--History--To 1500--Congresses.
Technological innovations--Europe--History--To 1500--Congresses.
Transportation--Technological innovations--Europe--Congresses.
Princeton subject headings:
Architecture, Medieval--Europe--Congresses.
Art, Medieval--Europe--Congresses.
Civilization, Medieval--Congresses.
Crusades--Congresses.
Europe--History--476-1492--Congresses.