Columbia subject headings:
Architecture--Austria--Vienna--History--19th century.
Bridges--Austria--Vienna.
Public buildings--Austria--Vienna.
Harvard subject headings:
Architecture--Austria--History--19th century.
Architecture--Austria--Vienna--History.
Bridges--Austria--Vienna.
Public buildings--Austria--Vienna.
Vienna (Austria)--Buildings, structures, etc.
Princeton subject headings:
Architecture--Austria--Vienna--19th century.
Bridges--Austria--Vienna.
Public buildings--Austria--Vienna.
Vienna (Austria)--Buildings, structures, etc.