Columbia subject headings:
Cultural property--Europe--Congresses.
Historic sites--Europe--Congresses.
Periodicals.
Harvard subject headings:
Princeton subject headings:
Castles--Europe--Congresses.
Castles--Europe--Periodicals.
Historic sites--Conservation and restoration--Europe--Congresses.
Historic sites--Conservation and restoration--Europe--Periodicals.
Monuments--Conservation and restoration--Congresses.
Monuments--Conservation and restoration--Periodicals.
Periodicals.