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Retrieved 26 June 2010.
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Zarenski, Ed (2004). "Limiting
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Zarenski, Ed (2004). "Limiting
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Cloudy Nights. Archived...
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Zarenski, Ed (2004). "Limiting
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Zarenski, Ed (2004). "Limiting
Magnitude in Binoculars" (PDF).
Cloudy Nights. Archived...