00281nam a2200109 a 450000500170000008200130001710000180003024500370004826000280008530000230011363000350013620251203091158.0  a337bCOB  aCobham, David  aEconomics of international trade  aWoodhead Faulknerc1979  a117 p.b22cm.cPB.  aEconomics- International trade