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Bortle Dark-Sky Scale / Stage lighting / Architecture / Optics / Electromagnetic radiation / International Dark-Sky Association / Dark-sky preserve / Light pollution / Skyglow / Lighting


  INTERNATIONAL  DARK-­‐SKY  ASSOCIATION   3223 N First Ave - Tucson Arizona[removed][removed]www.darksky.org TO   P RESERVE   A ND   P ROTECT   T HE   N IGHTTIME   E NVIRONMENT  
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Document Date: 2013-05-31 14:14:05

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