000 00300nam a2200121Ia 4500
008 180721s9999 xx 000 0 und d
100 _aConnor David J
245 0 _aCrop Ecology:Productivity and Management in Agricultural Systems
260 _bNil
260 _c0
365 _b0.00
942 _cBK
999 _c130591
_d130591