Vanishing night skies : the effects of light pollution on the National Park System : a survey by the National Parks and Conservation Association, March 1999 / prepared by David J. Simon and Scott R. Babcock.

Tucson : National Optical Astronomy Observatories, Kitt Peak National Observatory, [1999].

20 p. : ill. ; 22 cm.

To help ensure preservation of print and digital collections, this title is retained by Yale University Library on behalf of the HathiTrust Shared Print Program.

English

June 01, 2002