00253nam a2200121Ia 4500020001400000082001700014100002200031245002500053260002800078300001500106500000500121700000500126  a712101144  a330bT445.AE  aThirkettle, G. L.  aAdvanced economicsb  aLondonbMacDonaldc1968  axvi, 136p.  a  a