000 00316nam a2200121Ia 4500
008 220204s9999 xx 000 0 und d
082 _a026.33125
_bSPE;1
100 _aSPEDDING, C R W
245 0 _aBiology of agricultural systems.
260 _aLondon
_bAcademic
_c1975
650 _aAgricultural system
942 _cBK
999 _c28950
_d28950