00261nam a2200121Ia 45000030006000000080041000060400015000471000017000622450022000792600009001015460012001100050017001220STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aEinstein, A.  aEssays in physics  c1950  aEnglish20220125170107.0