Columbia subject headings:
Architecture--Germany--History--20th century--Exhibitions.
Otto, Frei, 1925-2015--Exhibitions.
Harvard subject headings:
Architects--Germany
Architecture--Germany--20th century--Exhibitions.
Architecture--Germany--History--20th century--Exhibitions
Lightweight construction.
Otto, Frei, 1925---Exhibitions.
Otto, Frei, 1925-2015--Exhibitions.
Princeton subject headings:
Architecture--Germany--20th century--Exhibitions.
Otto, Frei, 1925-2015--Exhibitions.