00561nam a2200217Ia 4500003000900000008004100009020001800050040001600068080001300084100001400097245003800111250001200149260003600161300001500197490003900212650002400251650001700275650001600292650002200308650001300330IN-BaIIA211028s9999    xx            000 0 eng d  a0-387-94943-7  cIIA Library  a524bHAR  aHarwit, M 0aAstrophysical conceptscM. Harwit  a3rd ed.  aNew YorkbSpringer-Verlagc1998  axiv, 615p.  aAstronomy and Astrophysics Library  aAstronomical Bodies  aAstrophysics  aCosmic Dust  aPlanetary Systems  aUniverse