00248nam a2200121Ia 4500020001400000082001700014100001800031245002600049260002800075300001300103500000500116700000500121  a71211629X  a330bM322.PE  aMarder, K. B.  aPractical economicsb  aLondonbMacDonaldc1970  ax, 301p.  a  a