00294nam a2200121 a 450000500170000002000150001708200130003210000180004524500200006326000420008330000280012563000190015320251202164143.0  a0199132941  a300bHEA  aHeater, Derek  aOur world today  aOxfordbOxford University Pressc1985  aviii, 151 p.b22cm.cPB  aSocial Science