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1by April, J.E., Colorado Univ., Boulder (USA) eng, Hersh, G.N., Rogers, D.J., Slater, C.C.
Published 1974Texto bibliotecaFAO IT -
2by April, J.E., FAO, Rome (Italy) eng, Expert Consultation on Agricultural Research in Latin America eng 9 Jun 1975 Panama City (Panama), Hersch, G.N., Rogers, D.J.
Published 1976Texto bibliotecaFAO IT -
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