Columbia subject headings:
Architecture--Netherlands--History--20th century.
Claus en Kaan--Catalogs.
Harvard subject headings:
Architectural firms--Netherlands.
Architecture--Netherlands--20th century.
Architecture--Netherlands--21st century.
Claus en Kaan
Princeton subject headings:
Architecture--Netherlands--21st century.
Architecture--Netherlands--History--20th century.
Claus en Kaan.