Sprague, George Frederick.

The development of hybrid corn technolgy in the United States and selected countries - Washington : Agency for International Development, 1975 - 81 p. - Agriculture technology for developing countries. Technical series bulletin ; 16 . - Agriculture technology for developing countries. Technical series bulletin ; 16 .

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Maíz--Híbridos.
Maíz--Mejoramiento.
Maíz--Proteínas.