Image:UofI selenium cell photometer mount refractor 1910.jpg
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Source: National Park Service
Author: Dr. John Dickel, 1910
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 01:57, 3 November 2006 | 350×441 (23 KB) | IvoShandor (Talk | contribs) | ({{PD-USGov-Interior-NPS}} Source: National Park Service Author: Dr. John Dickel, 1910) |
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