Columbia subject headings:
Cultural property--Protection--Germany--Potsdam--Congresses.
Historic districts--Conservation and restoration--Germany--Potsdam--Congresses.
Potsdam (Germany)--Buildings, structures, etc.--Congresses.
Harvard subject headings:
City planning--Germany--Potsdam--Congresses.
Historic buildings--Conservation and restoration--Germany--Potsdam.
Urbanization--Germany--Potsdam--Congresses.
Princeton subject headings: