Columbia subject headings:
Architecture--Austria--Vienna--History--20th century.
City planning--Austria--Vienna.
Historic preservation--Austria--Vienna.
Urban renewal--Austria--Vienna.
Vienna (Austria)--Buildings, structures, etc.--Conservation and restoration.
Harvard subject headings:
Architecture, Modern--20th century--Austria--Vienna.
Architecture, Modern--21st century
Architecture, Modern--Austria--Vienna--20th century.
Architecture--Austria--Vienna
Architecture--Conservation and restoration--Austria--Vienna.
City planning--Austria--Vienna
Urban renewal--Austria--Vienna.
Vienna (Austria)--Buildings, structures, etc.
Vienna (Austria)--Buildings, structures, etc.--Conservation and restoration.
Princeton subject headings: