Columbia subject headings:
Art nouveau (Architecture)--Austria--Vienna.
Vienna (Austria)--Buildings, structures, etc.
Wagner, Otto, 1841-1918.
Harvard subject headings:
Art nouveau (Architecture)--Austria--Vienna.
Vienna (Austria)--Buildings, structures, etc.
Wagner, Otto, 1841-1918--Criticism and interpretation.
Princeton subject headings:
Architecture--Austria--Vienna.
Wagner, Otto, 1841-1918.