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NAGODick ElffersLoopbaan
1962 - 1966 International Institute for Land Reclamation and Improvement ILRI

OBJECTEN

10 Years International Institute for Land Reclamation and ImprovementAcid Sulphate SoilsDrainage of Agricultural Land. A bibliographyInternational Institute for Land Reclamation and Improvement, Soil ripening and soil classification, publication 3