00329nam a2200133Ia 45000030006000000080041000060400015000471000040000622450020001022500010001222600034001325460012001660050017001780STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aPhilip Bell, W.; Michael Todaro, P.  aEconomic theory  aFirst  bOxford University pressc1973  aEnglish20220125165606.0