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Provisional list of insect and mite pests of food crops in Central America.
(Centro Agronómico Tropical de Investigación y Enseñanza, Turrialba (Costa Rica)., 1978)
Wildland conservation in Central America. Facets of wildland conservation in middle America
(CATIE, Turrialba (Costa Rica), 1978)
An understanding of the farming systems of small farmers in Central America: a research proposal submitted for the consideration of the Ford Foundation
(CATIE, Turrialba (Costa Rica), 1978)
Investigación en sistemas de cultivo en Centroamérica.
(CATIE, Turrialba (Costa Rica). Programa de Cultivos Anuales, 1978)