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 Digitized Sky Survey.   Association of Universities for Research in Astronomy.   <http://archive.stsci.edu/cgi-bin/dss_forms>.

 McDonald, Laura.  Skyview: The Internet's Virtual Telescope.  NASA.  <http://skyview.gsfc.nasa.gov/skyview.html>.

 Peat, Chris.  Heavens Above.   <http://www.heavens-above.com/>.