000 00282nam a2200121Ia 4500
008 161121s9999 xx 000 0 und d
100 _aVan Keulen (H.);J. Wolf
245 0 _aModelling of Agricultural Production: We
260 _cNIL
365 _b0
650 _aNIL
942 _cBK
999 _c93893
_d93893