Guiding principles of activity, based on the application of scientific method what sociologists should know for the radical improvement of the life of man by De Haan, D. Bierens

Underwater audiogram of a Pacific walrus (Odobenus rosmarus divergens) measured with narrow-band frequency-modulated signals. by Kastelein, R.A

Recent increase of North Sea houting and prospects for recolonization in the Netherlands. by Kranenbarg, J.