De Vries, C. A.

Agricultural extension in the developing countries; a bibliography - Wageningen : International Institute for Land Reclamation and Improvement, 1968 - 125 p. - International Institute for Land reclamation and Improvement . Bibliography ; 7 . - International Institute for Land reclamation and Improvement . Bibliography ; 7 .

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Extensión agrícola--Países subdesarrollados--Bibliografía.

630.717 / D4