Butler, F E <br/><br/>
Signpost to the stars 

 - 4th ed. 
 - London  George Philip  1970 
 - 33p.   
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<br/><br/><label>Subjects--Index Terms: </label>Astronomical physics  Physics, Astronomical  Astrophysics  Spectroscopy  black holes  Spectrum analysis  Astronomy  Physics  Stars  Stars  black holes  Astrophysics 
<br/><br/><label>Dewey Class. No.: </label>523.8