File:PSM V55 D534 Graphic representations of mental fatigue 1.png

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English: Graphic representations of mental fatigue 1
Date
Source Popular Science Monthly Volume 55
Author Unknown authorUnknown author

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Public domain
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.
United States
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current22:44, 1 June 2011Thumbnail for version as of 22:44, 1 June 20111,811 × 570 (41 KB)Ineuw (talk | contribs)

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