Project code 61591. - Research project commissioned by the Ministry of Agriculture, Nature Management and Fisheries, The Netherlands, and carried out ...
Project code 61591. - Research project commissioned by the Ministry of Agriculture, Nature Management and Fisheries, The Netherlands, and carried out by the Agricultural Economics Research Institute (LEI).
Include bibliographic references: p. 61-64.
Author also transcribed by Theo H. Jonker (preface: page 9) and by Jonker, T.H. (page III).