Columbia subject headings:
Architecture--Conservation and restoration--Austria.
Architecture--Conservation and restoration--Germany (West)
Architecture--Conservation and restoration.
City planning--Austria--History--20th century.
City planning--Germany (West)--History--20th century.
City planning.
Harvard subject headings:
Architecture--Conservation and restoration
Architecture--Europe--Conservation and restoration.
Cities and towns--Europe--Conservation and restoration.
Historic buildings--Conservation and restoration--Europe.
Urban renewal--Europe
Princeton subject headings:
Architecture--Austria--Conservation and restoration.
Architecture--Conservation and restoration.
Architecture--Germany (West)--Conservation and restoration.
City planning--Austria--History--20th century.
City planning--Germany (West)--History--20th century.
City planning.