Columbia subject headings:
Harvard subject headings:
Archaeology, Medieval--Europe, Northern--Congresses.
Cistercian architecture--Europe, Northern--Congresses.
Cistercian monasteries--Europe, Northern--Congresses.
Europe, Northern--Antiquities--Congresses.
Excavations (Archaeology)--Europe, Northern--Congresses.
Princeton subject headings:
Cistercian architecture.
Excavation.