Columbia subject headings:
Architecture--Conservation and restoration--Europe--Congresses.
City planning--Europe--Congresses.
Historic districts--Conservation and restoration--Europe--Congresses.
Harvard subject headings:
Architecture--Conservation and restoration--Europe--Congresses.
City planning--Europe--Congresses
Historic districts--Conservation and restoration--Europe--Congresses.
Princeton subject headings:
Architecture--Conservation and restoration--Europe--Congresses.
City planning--Europe--Congresses.
Historic districts--Conservation and restoration--Europe--Congresses.