Columbia subject headings:
Civilization, Medieval.
Europe--Religious life and customs--History--To 1500.
Religious communities--Europe--History--To 1500.
Technological innovations--Europe--History--To 1500.
Harvard subject headings:
Civilization, Medieval
Europe--Religious life and customs--History--To 1500.
Religious communities--Europe--History--To 1500.
Technological innovations--Europe--History--To 1500.
Princeton subject headings: