00269nam a2200121Ia 45000030006000000080041000060400015000471000022000622450014000842600020000985460012001180050017001300STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aBacker Robert, H.  aAstronomy  bMacmillanc1930  aEnglish20220125170008.0