Columbia subject headings:
Agriculture--Europe--History--Congresses.
Archaeology, Medieval--Congresses.
Excavations (Archaeology)--Europe--Congresses.
Land use--Europe--History--Congresses.
Harvard subject headings:
Agriculture--Europe--History--Congresses.
Agriculture--Europe--History--To 1500--Congresses.
Archaeology, Medieval--Congresses.
Excavations (Archaeology)--Europe--Congresses
Land use--Europe--History--Congresses.
Land use--Europe--History--To 1500--Congresses.
Princeton subject headings: