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	1.	No cover image available Investigaciones en manejo de suelos tropicales en Yurimaguas, Selva Baja del Perú by Sánchez, Pedro Seubert, Christopher Tyler, Edward Valverde, Carlos López, César nureña, Marco Wade, Michael Reunión internacional sobre sistemas de producción para el trópico americano ( 10-15 juin 1974 : Lima) Series: Informes de conferencias cursos y reuniones, 41 Material type: Article; Format: print ; Literary form: Not fiction Language: Spa In: Reunión internacional sobre sistemas de producción para el trópico americano (sistema de uso de la tierra) p. ii-b-ii-b36 : graph., tab. Availability: No items available.
	2.	No cover image available The fertilization of potatoes in Peru : I : a summary and interpretation of data from field experiments completed from 1959 through 1964 in the Sierra by McCollum, Robert [éd] McCollum, Robert [comp] Valverde, Carlos [collab] Material type: Text; Format: print ; Literary form: Not fiction Language: Eng Publication details: Lima : North Carolina university-Mission to Peru, 1966 Availability: Items available for loan: Biblioteca IFEA (1)Call number: Am.Agr737. Place hold

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