J. De Vries

• European Urbanisation
• How to Live a Healthy Life (Jan de Vries Healthcare)
• Realistic Weight Control (By Appointment Only)
• Columbia, gisteren, vandaag en morgen; met zestien illustraties
• Constraints to successful communal production
• Has extension failed?
• Lymphokines
• Radio bij de navigatie ter zee
• Selected bibliography on agricultural extension in Tanzania
• The cost implications of owning and operating forest machinery in Australia
• Ujamaa villages and problems of institutional change, with emphasis on agricultural extension and development