Image:UofI photoelectric photometer 1913 mount on refractor.jpg
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Source: National Park Service
Author: Dr. John Dickel, 1913
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 01:55, 3 November 2006 | 350×446 (14 KB) | IvoShandor (Talk | contribs) | ({{PD-USGov-Interior-NPS}} Source: National Park Service Author: Dr. John Dickel, 1913) |
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