Image:UofI photoelectric photometer 1913 mount on refractor.jpg
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This article or image contains material based on a work of a National Park Service employee, created during the course of the person's official duties. As a work of the U.S. federal government, such work is in the public domain. See the NPS website and NPS copyright policy for more information.
Source: National Park Service
Author: Dr. John Dickel, 1913
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- (del) (cur) 01:55, 3 November 2006 . . IvoShandor (Talk | contribs) . . 350×446 (13,979 bytes) ({{PD-USGov-Interior-NPS}} Source: National Park Service Author: Dr. John Dickel, 1913)
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