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  • 21 Aug, 2019

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File:UofI Selenium Cell Photometer Mount Refractor 1910.jpg
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current08:55, 18 August 2010Thumbnail for version as of 08:55, 18 August 2010350 × 441 (23 KB)XIIIfromTOKYO{{Information |Description=selenium cell photometer mounted on a refractor, 1910, University of Illinois Observatory |Source=National Park Service |Date=1910 |Author=Dr. John Dickel |Permission={{PD-USGov-Interior-NPS}} |other_versions= }} [[Category:Univ

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