00540nam a2200169Ia 4500003000900000008004100009020001800050040001600068080001500084100002300099245009600122260005900218300000900277650002800286650004100314650001500355IN-BaIIA211028s9999    xx            000 0 eng d  a0-87169-674-6  cIIA Library  a520.2bHEL  aHelden, Albert Van 4aThe invention of the telescopecAlbert Van Helden                                            aPhiladelphiabThe American Philosophical Societyc1977  a67p.  aAstronomical telescopes  aAstronomy and astrophysics thesaurus  aTelescopes