00426nam a2200145Ia 4500008004100000020001500041082001600056100002200072245003400094260004900128300000800177650004100185650003400226653002000260170901s1981    xx            000 0 und d  a0835980286  a631.5bS84U  aStoskopf, Neal C. 0aUnderstanding crop production  aRestonbReston Publishing Company Inc.c1981  a433  aAgriculture and related technologies  aTechnology (Applied sciences)  aCrop production