00577nam a2200181Ia 4500003000900000008004100009040001600050080002400066100001300090245010300103260006800206300002300274650004100297650001100338700001600349700001600365700001400381IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a082.2:52bIAU-C25:1  aDonn, B. 4aThe study of cometsbpt. 1cB. Donn.. [et al.]                                                      aWashingtonbNational Aeronautics and Space Administrationc1976  a[various pagings.]  aAstronomy and astrophysics thesaurus  aComets  aA'Hearn, M.  aJackson, W.  aMumma, M.