Columbia subject headings:
Harvard subject headings:
Architects--Austria.
Architectural firms--Austria.
Architecture--Europe--21st century.
Architecture--Europe--History--20th century
Ortner & Ortner--Catalogs.
Ortner, Laurdis, 1941---Catalogs.
Ortner, Manfred, 1943---Catalogs.
Public architecture--Europe.
Princeton subject headings:
Architecture--Europe--History--20th century.
Ortner & Ortner--Themes, motives.