Columbia subject headings:
Building, Wooden--Europe--Congresses.
Building, Wooden--Gaul--Congresses.
Earthworks (Archaeology)--Europe--Congresses.
Earthworks (Archaeology)--Gaul--Congresses.
Europe--Antiquities--Congresses.
Gaul--Antiquities--Congresses.
Harvard subject headings:
Building, Wooden--Europe--Congresses.
Building, Wooden--Gaul--Congresses.
Earthworks (Archaeology)--Europe--Congresses.
Earthworks (Archaeology)--Gaul--Congresses.
Europe--Antiquities--Congresses.
Gaul--Antiquities--Congresses.
Princeton subject headings:
Architecture, Domestic--History--Congresses.
Architecture, Roman--Congresses.
Roman provinces--Antiquities--Congresses.