Columbia subject headings:
Harvard subject headings:
Architecture--Austria--Vienna--History.
Ringstrasse (Vienna, Austria)
Ringstrasse (Vienna, Austria)--History--19th century.
Ringstrasse (Vienna, Austria)--History--20th century.
Streets--Austria--Ringstrasse (Vienna)
Streets--Austria--Vienna
Vienna (Austria)--Buildings, structures, etc.
Vienna (Austria)--Description and travel.
Princeton subject headings:
Architecture--Austria--Vienna--History.
Ringstrasse (Vienna, Austria)--History--19th century.
Ringstrasse (Vienna, Austria)--History--20th century.
Streets--Austria--Vienna.
Vienna (Austria)--Buildings, structures, etc.
Vienna (Austria)--Description and travel.