Light Pollution
http://www.darksky.org/ (Rank: 209253)
http://www.cie.co.at/ (Rank: 408692)
http://www.iesna.org/ (Rank: 436333)
http://www.ile.org.uk/ (Rank: 663508)
http://www.flap.org/ (Rank: 877431)
http://selene-ny.org/ (Rank: 936875)
http://www.ibiblio.org/ncida/ (Rank: 1201482)
http://home.att.net/~icole/ (Rank: 1283001)
http://www.volt.org/ (Rank: 1382909)
http://www.fvas.net/ (Rank: 1453935)
http://www.lightpollution.org.uk (Rank: 1554900)
http://www.lightpollution.it/dmsp/ (Rank: 1707577)
http://www.scn.org/darksky/ (Rank: 1713505)
http://www.cfa.harvard.edu/nelpag/nelpag.html (Rank: 1893023)
http://www.timesunion.com/communities/darksky/ (Rank: 2079926)
http://www.physics.emich.edu/sherzer/lightpol.htm (Rank: 2094898)
http://www.mv.com/users/lopez/nhcrl/ (Rank: 2224543)
http://www.communities.gov.uk/archived/publications/planningandbuilding/lighting (Rank: 2226326)
http://www.eso.org/outreach/spec-prog/aol/market/collaboration/lpoll/ (Rank: 2249234)
http://www.iac.es/proyect/otpc/ (Rank: 2262061)