00565nam a2200181Ia 4500003000900000008004100009020001900050040001600069080001900085100002500104245010700129250001200236260004800248300001600296650001400312650004100326650001600367IN-BaIIA211028s9999    xx            000 0 eng d  a0-521-35699- 7  cIIA Library  a52:681.31bDUF  aDuffett-Smith, Peter 0aPractical astronomy with your calculatorcPeter Duffett-Smith                                           a3rd ed.  aCambridgebCambridge University Pressc1990  axiii, 185p.  aAstronomy  aAstronomy and astrophysics thesaurus  aCalculators