00305nam a2200121Ia 45000030006000000080041000060400015000471000021000622450049000832600022001325460012001540050017001660STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aLeonard Silk, S.  aContemporary economics principles and issues  bMcgraw hillc1970  aEnglish20220125165610.0