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Soil science in Costa Rica; classification, fertility and conservation
(CATIE, Turrialba (Costa Rica), 1978)
Soil fertility investigation in Honduras, 1977.
(Centro Agronómico Tropical de Investigación y Enseñanza, Turrialba (Costa Rica)., 1978)
Consultant's final report to CATIE and ROCAP on completion of soil analog subprojet.
(CATIE, Turrialba (Costa Rica)., 1977)