00258nam a2200109Ia 4500082001900000100002000019245005200039260003200091300001500123500000500138700000500143  a330.08bK82.TE  aKoopmans, T. C.  aThree essays on the state of economic scienceb  aNew YorkbMcGraw-Hillc1957  axii, 231p.  a  a