00305nam a2200121Ia 45000030006000000080041000060400015000471000025000622450047000872600020001345460012001540050017001660STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aContant Levi Leonard  aNumbers concept its origin and development  bMacmillanc1923  aEnglish20220125165931.0