00281nam a2200121Ia 45000030006000000080041000060400015000471000013000622450035000752600020001105460012001300050017001420STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aDe, H.K.  aChemical problems and theories  bMacmillanc1918  aEnglish20220125170239.0