Columbia subject headings:
Architecture--Germany--History--20th century--Exhibitions.
Architecture--Netherlands--History--20th century--Exhibitions.
de Architekten Cie--Exhibitions.
Harvard subject headings:
Architecture, Modern--20th century--Exhibitions
Architecture--Germany--20th century--Exhibitions.
Architecture--Netherlands--20th century--Exhibitions.
Germany--Buildings, structures, etc.--Exhibitions.
Netherlands--Buildings, structures, etc.--Exhibitions.
de Architekten Cie--Exhibitions.
Princeton subject headings: