00848nam a2200193Ia 4500003000900000008004100009040001600050080002300066111008500089245023900174260006800413300001500481490002400496500002600520650004100546650001100587700001800598710003800616IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a523.64(082.2)bDON  aInternational Astronomical Union Colloquiumn25thcMarylandd1974 Oct. 28-Nov. 1 4aThe study of cometsbpt. 2, proceedings of the International Astronomical Union Colloquium No.25, Co-sponsored by COSPAR and held at Goddard Space Flight Center, Green Belt, Maryland, October 28-November 1, 1974cedited by B. Donn      aWashingtonbNational Aeronautics and Space Administrationc1976  a537-1083p.  aNASA SP-393; no. 25  aDonated by Mrs. Bappu  aAstronomy and Astrophysics Thesaurus  aComets  aDonn, B., ed.  aInternational Astronomical Union