00309nam a2200133Ia 45000030006000000080041000060400015000471000023000622450028000852500011001132600022001245460012001460050017001580STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aChurchill Ruel, V.  aOperational mathematics  aSecond  bMcgraw hillc1958  aEnglish20220125165950.0