Columbia subject headings:
Architects--Belgium--Biography.
Architects--Netherlands--Biography.
Architecture, Dutch.
Architecture, Flemish.
Architecture--Belgium--History--20th century.
Architecture--Netherlands--History--20th century.
Harvard subject headings:
Architects--Belgium.
Architects--Netherlands.
Architectural firms--Belgium.
Architectural firms--Netherlands.
Architecture--Belgium--20th century.
Architecture--Netherlands--20th century.
Princeton subject headings:
Architecture--Belgium--Flanders--20th century.
Architecture--Netherlands--History--20th century.