00486nam a2200169Ia 4500008004100000020001500041082001400056100002400070245004500094250000600139260005000145300000800195650004100203650003400244653001600278700002200294170901s1972    xx            000 0 und d  a0023807105  a633bM57C  aMetcalfe, S. Darrel 0aCrop Production Principles and Practices  a1  aNew YorkbMacmillan Publishing Co. Inc.c1972  a774  aAgriculture and related technologies  aTechnology (Applied sciences)  aField crops  aElkins, M. Donald