00542nam a2200181Ia 4500003000900000008004100009040001600050080001600066100002500082245011400107250001200221260002600233300001500259650004100274650001100315650001700326700001700343IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a523.64bRIC  aRichter, Nikolaus B. 4aThe nature of cometscNikolaus B. Richter, translated by Arthur Beer                                           arev ed.  aLondonbMethuenc1963  axli, 221p.  aAstronomy and astrophysics thesaurus  aComets  aSolar system  aBeer, Arthur