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4Texto bibliotecaUAAAN MX
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7Report bibliotecaCGIAR
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9Texto bibliotecaCOLPOS
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10article bibliotecaUNESCO
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11Texto bibliotecaECOSUR
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12
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13Texto bibliotecaFAO IT
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15Texto bibliotecaUAAAN MX
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18by Ross, J.E., National Rural Electric Cooperative Association, Washington, D.C. (USA) eng
Published 1972Texto bibliotecaFAO IT -
19by Ross, J. (ed.), FAO, Rome (Italy). Direccion de Desarrollo Rural y Reforma Agraria spa
Published 2001Texto bibliotecaFAO IT -
20by Rice, Amanda Nicole, Ross, J. Perran, Woodward, Allan R., Carbonneau, Dwayne A., Percival, H. Franklin
Published 2007article bibliotecaUNESCO