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Chanan Greenberg


Ċ AmateurAstrophotography-Greenberg.pdf
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Amateur Digital Astrophotography: the affordable end of the spectrum  742k v. 6 Feb 20, 2010, 11:23 PM Kenneth Frank
Ċ BuildRollOffRoofObs.pdf
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Building a Roll-Off Roof Observatory for under $1,400  1461k v. 6 Feb 20, 2010, 11:24 PM Kenneth Frank
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Greenhawk Observatory Home Page
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http://www.greenhawkobservatory.com/  Feb 17, 2013, 8:00 AM Alan Gould
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Interactive Messier Catalog
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http://www.greenhawkobservatory.com/#%21messier-catalog-greenberg-companion  Feb 17, 2013, 7:59 AM Alan Gould
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