File:PSM V19 D766 Calculating earth mass by triangulation.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:34, 21 August 2010 | 683 × 1,918 (34 KB) | Ineuw | {{Information |Description = Calculating earth mass by triangulation |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_19.djvu/766 |Date = 1881 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Category:Po |
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