00293nam a2200133Ia 45000030006000000080041000060400015000471000024000622450024000862500011001102600009001215460012001300050017001420STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aSingleton Ralph, W.  aElementary genetics  aSecond  c1969  aEnglish20220125170446.0