Columbia subject headings:
Architecture, Modern--20th century.
Ungers, O. M. (Oswald Mathias)
Harvard subject headings:
Architects--Germany
Architecture, Modern--20th century--Germany--Catalogs.
Architecture--Germany--Catalogs.
Architecture--Germany--History--20th century--Catalogs
Ungers, O. M. (Oswald Mathias)--Catalogs.
Princeton subject headings: