File:Yerkes Observatory Astro4p6.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	08:07, 30 May 2008		450 × 354 (21 KB)	CarolSpears	{{Information \|Description=Alvin Clark and his assistant Carl Ludin (right) alongside of the 40-inch Lens, 1896. \|Source=[http://www.nps.gov/history/history/online_books/butowsky5/astro4pp.htm#1 Astronomy and Astrophysics Yerkes Observatory] \|Date=1988 \|A

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