File:PSM V40 D768 Reading colors arranged in three rows at 90 second intervals.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:56, 11 December 2010 | 1,016 × 1,768 (65 KB) | Ineuw | {{Information |Description = Reading colors arranged in three rows at 90 second intervals |Source = [http://www.archive.org/details/popularsciencemo401892newy Popular Science Monthly Volume 40] |Date = 1891-1892 |Author = |
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