00355nam a2200121Ia 4500082002200000100002000022245007100042260004800113300002000161490004200181500000500223700000500228  a304.6209bG857.PG  aGrigg, David B.  aPopulation growth and agrarian change; an historical perspectiveb  aCambridgebCambridge University Pressc1980  axi, 340p. Index  aCambridge Geographical studiesv v.13  a  a