Columbia subject headings:
Architecture--Composition, proportion, etc.--Exhibitions.
Ungers, O. M. (Oswald Mathias)--Exhibitions.
Harvard subject headings:
Architects--Germany--Exhibitions.
Architectural drawing--Germany--20th century--Exhibitions.
Architectural models--Germany--Exhibitions.
Architecture, Modern--20th century--Germany--Exhibitions.
Architecture--Composition, proportion, etc.--Exhibitions.
Ungers, O. M. (Oswald Mathias)--Exhibitions.
Princeton subject headings: