00302nam a2200121Ia 45000030006000000080041000060400015000471000018000622450062000802600009001425460012001510050017001630STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aCarslaw, H.S.  aElements of non Euclidean plane geometry and trigonometry  c1916  aEnglish20220125170006.0