00300nam a2200121Ia 4500020001500000082001900015245005200034260003400086700000500120500000500125100002400130300002400154  a0258969385  a338.1bR612.AE  aAgricultural Economics; principles and policyb  aLondonbCrosby Lockwoodc1977  a  a  aRitson, Christopher  axiii, 409p., index.