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