Columbia subject headings:
Harvard subject headings:
Architects--Belgium.
Architecture, Modern--20th century--Belgium.
Architecture, Modern--20th century--Germany--Kassel.
Architecture, Modern--20th century--Netherlands--Rotterdam.
Architecture, Modern--21st century
Architecture--Germany--Kassel--20th century.
Architecture--Netherlands--Rotterdam--20th century.
Daem, Hilde--Catalogues raisonnés.
Robbrecht, Paul--Catalogues raisonnés.
Princeton subject headings:
Architects--Belgium.
Architecture--20th century--Belgium.
Architecture--20th century--Germany--Kassel.
Architecture--20th century--Netherlands--Rotterdam.
Daem, Hilde--Catalogues raisonnés.
Robbrecht, Paul--Catalogues raisonnés.