000			00466nam a2200145Ia 4500
008			130903s9999 xx 000 0 und d
082			_a63.001.3(100) L4
245			_aThe agricultural systems of the world; an evolutionary approach.
260			_aLondon _bCambridge University _cc 1974
300			_aix,358p.
490			_aCambridge Geographical Studies, 5
600			_aGrigg, D.B.
650			_aAgriculture-evolution,Agriculture-classification
942			_cGRBK
999			_c82951 _d82951