00521nam a2200169Ia 4500008004100000020001500041082001700056100002500073245007100098260005100169300000800220650004100228650003400269653001600303653001300319700001900332170901s1985    xx            000 0 und d  a0931477115  a630.72bH63O  aHildebrand, Peter E. 0aOn-Farm Agronomic Trials in Farming Systems Research And Extension  aColoradobLynne Rienner Publishers, Inc.c1985  a162  aAgriculture and related technologies  aTechnology (Applied sciences)  aAgriculture  aResearch  aPoey, Federico