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