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1Organic agriculture: economic and ecological comparisons with conventional methods Organic agriculture: economic and ecological comparisons with conventional methodsby Oelhaf, R.C.“...Montclair, N.J. (USA) Allanheld, Osmun and Co. Pub....”
Published 1978
Texto bibliotecaFAO IT -
2The plant protection discipline; problems and possible developmental strategies The plant protection discipline; problems and possible developmental strategiesby Sill, W.H. Jr.“...Montclair, N.J. (USA) Allanheld, Osmun and Co. Pub....”
Published 1978
Texto bibliotecaFAO IT