00272nam a2200121Ia 45000030006000000080041000060400015000471000012000622450038000742600009001125460012001210050017001330STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aIrala,N  aMental efficiency without Fatigue  c1997  aEnglish20220125165317.0