000 00353nam a2200145Ia 4500
008 131111s9999 xx 000 0 und d
100 _aGrigg, D.B.
245 _aAgricultural systems of the world;an evolutionary approach
260 _aLondon
260 _bCambridge
260 _c1974
300 _a358p.
650 _aAgriculture
763 _a14988
999 _c52570
_d52570