- Contest for young architects, State Mines Sales Office. 'Competition for architects devoted to the improvement of the
 architectural aspects of the arrangement of plants for coal and coke'. 1962 (no. 7).
- Competition for Sculpture, J.C. Nijsen, The Hague, 1962 (no. 8).
- Contest for 'Verifying Certificate'. 1963 (no. 9).
- Competition Institute for Poultry Breeding 'Het Spelderholt'. 1962-1963 (no. 10).