00324nam a2200109Ia 4500082002000000100003600020245006500056260004400121300001300165500000500178700003100183  a338.15bH433.RD  aHeady, E. O. and Tweeten, L. G.  aResource demand and structure of the agricultural industryb  aAmesbIowa State University Pressc1963  ax, 515p.  a  aTweeten, L. G. ; jt. auth.