Research on cropping systems.
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| Format: | Texto biblioteca |
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1969
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| Subjects: | RU AER, CROP ROTATION, CROPPING SYSTEMS, RESEARCH, AGRICULTURAL DEVELOPMENT, AFRICA SOUTH OF SAHARA, ROTATION CULTURALE, SYSTEME DE CULTURE, RECHERCHE, ROTACION DE CULTIVOS, SISTEMAS DE CULTIVO, INVESTIGACION, DEVELOPPEMENT AGRICOLE, AFRIQUE AU SUD DU SAHARA, DESARROLLO AGRICOLA, AFRICA AL SUR DEL SAHARA, |
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