000 00316nam a2200121Ia 4500
008 160601s9999 xx 000 0 und d
100 _aGrigg D B
_931427
245 _aAgricultural systems of the world, an evaluationary approach
260 _aLondon
260 _bCambridge Univ Pr
260 _c1976
300 _a358
999 _c10487
_d10487