File:PSM V57 D371 A case of refraction.png

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English: A case of refraction
Date
Source Popular Science Monthly Volume 57
Author Unknown authorUnknown author

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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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current03:42, 12 July 2011Thumbnail for version as of 03:42, 12 July 20111,021 × 305 (75 KB)Ineuw (talk | contribs)

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