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