00308nam a2200133Ia 45000030006000000080041000060400015000471000019000622450045000812500010001262600009001365460012001450050017001570STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aKlaf Albert; A  aTrigonometry Refresher for Technical Men  aFirst  c1946  aEnglish20220125170009.0