00423nam a2200145Ia 4500008004100000020001500041082001600056100002200072245003400094260004600128300000800174650004100182650003400223653002000257170901s1981    xx            000 0 und d  a0835980286  a631.5bS84U  aStoskopf, Neal. C 0aUnderstanding Crop Production  aUSAbReston Publishing Company, Incc1981  a433  aAgriculture and related technologies  aTechnology (Applied sciences)  aCrop production