Jansen, B.H. Wienk, J.F. ( Ed. ) Mechanized annual cropping on low fertility acid soils in the humid tropics : A case stydy of the Zanderij soils in Suriname / by B.H. Janssen and J.F. Wienk ISBN: 90-6754-172-9 Dewey Class. No.: 613.3 / MEC