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Alvan Graham Clark
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==References== {{Reflist}} * {{cite encyclopedia | url = http://reference.allrefer.com/encyclopedia/C/Clark-Al.html | title = Alvan Clark, Astronomy, Biographies | encyclopedia = AllRefer.com | url-status = dead | archive-url = https://web.archive.org/web/20040623152608/http://reference.allrefer.com/encyclopedia/C/Clark-Al.html | archive-date = 2004-06-23 }} * [http://www.deller.com/newpage6.htm The Dearborn Telescope] * [http://chandra.harvard.edu/photo/2000/0065/index.html Sirius A & B: A Double Star System In The Constellation Canis Major] * [http://www.astro.northwestern.edu/Observatory/chronology2.html Northwestern University Astronomy and Astrophysics β History of Dearborn Observatory] {{Webarchive|url=https://web.archive.org/web/20190713091718/http://www.astro.northwestern.edu/Observatory/chronology2.html |date=July 13, 2019 }} * [http://www.boston.com/news/local/articles/2008/02/02/look_south_to_see_winters_brightest_constellations Look south to see winter's brightest constellations]
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