00496nam a2200169Ia 4500082002200000100001600022245006700038260004800105300001300153500000500166690000600171700000500177952010300182964001700285921000900302999001500311  a338.1091bG857.AS  aGrigg, D. B  aAgricultural systems of the world; and evolutionary approachb  aCambridgebCambridge University Pressc1974  ax, 358p.  a  a   a  00104070aISIbISId1998-08-17l0o338.1091 G857.ASpDP8765r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a4574  c4574d4574