Columbia subject headings:
Architecture--Austria--Vienna--History.
Architecture--Austria--Vienna.
K.K. Oesterreichische Postsparkassenamt.
Vienna (Austria)--Buildings, structures, etc.
Wagner, Otto, 1841-1918.
Harvard subject headings:
Princeton subject headings:
Architecture--Austria--Vienna--History.
Architecture--Austria--Vienna.
K.K. Oesterreichische Postsparkassenamt.
Vienna (Austria)--Buildings, structures, etc.
Wagner, Otto, 1841-1918.