Blockdiagrams / D.A. GoosenA study of geomorphology and soils in the middle Magdalena valley, Colombia / by D. GoosenPhysiography and soils of the Llano Orientalis, Colombia / D. GoosenBlockdiagrams / by D.A. GoosenPhysiography and soils of the Llano Orientalis, Colombia / D. GoosenThe language of soil : public lecture / delivered by Doeko GoosenPhysiography and soils of the Llanos Orientales, Columbia / Doeko Goosen