Columbia subject headings:
Architecture, Modern--20th century.
Architecture--Environmental aspects.
Otto, Frei, 1925-2015--Aesthetics.
Harvard subject headings:
Architects--Germany
Architecture, Modern--21st century
Architecture--Environmental aspects
Otto, Frei, 1925-
Otto, Frei, 1925-2015--Aesthetics.
Princeton subject headings:
Architecture, Modern--20th century.
Architecture--Environmental aspects.
Otto, Frei, 1925-2015--Aesthetics.