00284nam a2200121Ia 45000030006000000080041000060400015000471000019000622450043000812600009001245460012001330050017001450STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aEllis John, P.  aTheory and operation of the slide rule  c1961  aEnglish20220125170024.0