Columbia subject headings:
Archaeology--Congresses.
Buildings--Congresses.
Harvard subject headings:
Architecture--Conservation and restoration--Congresses
Architecture--Europe--History--Congresses.
Europe--Antiquities--Congresses.
Europe--Buildings, structures, etc.--Congresses.
Excavations (Archaeology)--Europe--Congresses
Historic buildings--Conservation and restoration--Congresses.
Historic buildings--Europe--Congresses.
Princeton subject headings:
Architecture--Europe--History--Congresses.
Europe--Antiquities--Congresses.
Europe--Buildings, structures, etc.--Congresses.
Historic buildings--Europe--Congresses.