Front cover image for Preserving the astronomical sky : proceedings of the 196th Symposium of the IAU held in United Nations Vienna International Conference Centre, in conjunction with UNISPACE III at Vienna, Austria, 12-16 July 1999

Preserving the astronomical sky : proceedings of the 196th Symposium of the IAU held in United Nations Vienna International Conference Centre, in conjunction with UNISPACE III at Vienna, Austria, 12-16 July 1999

Print Book, English, ©2001
Astronomical Society of the Pacific, San Francisco, Calif., ©2001