00294nam a2200121Ia 45000030006000000080041000060400015000471000021000622450051000832600009001345460012001430050017001550STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aMorse Antony, P.  aTheory of sets monographs and text book series  c1965  aEnglish20220125165921.0