Columbia subject headings:
Architecture--Austria--Vienna--History--20th century.
Architecture--Austria--Vienna.
Wagner, Otto, 1841-1918.
Harvard subject headings:
Architecture, Modern--20th century--Austria--Vienna.
Architecture--Austria--History--19th century.
Vienna (Austria)--Buildings, structures, etc.
Wagner, Otto, 1841-1918.
Princeton subject headings:
Architecture, Modern--20th century--Austria--Vienna.
Architecture--Austria--Vienna--Designs and plans.
Wagner, Otto, 1841-1918.