00300nam a2200121Ia 4500020001500000082002300015245005700038260004200095500000500137700000500142100001800147300001300165  a0198594526  a338.10184bUP71.AP  aAgricultural production economics and resource useb  aLondonbOxford University Pressc1976  a  a  aUpton, Martin  ax, 357p.