First World Atlas of the Artificial Night-Sky Brightness.
http://arxiv.org/abs/astroph/0108052
(MNRAS)
Cinzano, Falchi and Elvidge.
Radiance calibrated, HR DMSP + modeling of light propagation in the atmosphere.
DOE population database.
99% US pop. Under polluted skies.
2/3 US pop/20% world – lost Milky Way.
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