00825nam a2200241Ia 4500003000900000008004100009040001600050080002400066100001900090245010300109260006800212300002300280650004100303650001600344650002000360650001700380700002200397700002200419700002000441942000700461999001500468952010000483IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a082.2:52bIAU-C25.2  aDonn, B.99421 4aThe study of cometsbpt. 2cB. Donn.. [et al.]                                                      aWashingtonbNational Aeronautics and Space Administrationc1976  a[various pagings.]  aAstronomy and astrophysics thesaurus  aComets9755  aPeriodic comets  aSolar system  aA'Hearn, M.99422  aJackson, W.99423  aMumma, M.99424  cBK  c5415d5415  00104070aBANbBANcGENd1977-03-07l0o082.2:52/ IAU-C25.2p6053r2021-11-05w1977-03-07yBK