000 00290nam a2200133Ia 4500
008 161121s9999 xx 000 0 und d
100 _aSPEDDING (CRW)
245 0 _aBiological efficiency in agriculture
260 _cNIL
365 _b0
650 _aNIL
652 _a#N/A
942 _cBK
999 _c59052
_d59052