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2
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The design and management of call system training in on-farm research / Robert Tripp, Ponniah Anandajayasekeram and Gustavo Sain.
- International Maize and Wheat Improvement Center,
- 1990.
- México, D.F. :
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The economic returns to institutional innovations in national agricultural research : on-farm research in IDIAP Panama / Juan Carlos MartÃnez, Gustavo SaÃn.
- Centro internacional de mejoramiento de maiz y trigo (Cimmyt),
- 1983.
- México, D.F. :