00383nam a2200121Ia 4500008004100000082002400041100002000065245005200085260002700137300001300164600001900177650006500196140224s9999    xx            000 0 und d  a62(086.5):63.002 M6  aHunt, Donnel R.  aEngineering models for agricultural production/  aConnecticutbAVIc1986  axi,260p.  aDonnel R. Hunt  aAgricultural engineering-Mathematical models,System analysis