000 003330000a22001450004500
060 _a100
082 _a631.53 SIM
100 _aSimmonds, N W
245 _aPrinciples of crop improvement
260 _aLondon, Longman group ltd
260 _c1979
300 _a1979
650 _aPlant- breeding/crop improvement
942 _cBK
999 _c210602
_d210602