File:PSM V53 D074 Comparative altitudes.png

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Description Comparative altitudes
Date
Source Popular Science Monthly Volume 53
Author Unknown authorUnknown author
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Extracted image from book, to grayscale, cropped whitespace. Modifications made by Ineuw. The original can be found here: Popular Science Monthly Volume 53.

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current22:42, 14 May 2011Thumbnail for version as of 22:42, 14 May 20111,761 × 1,917 (246 KB)Ineuw (talk | contribs){{Information |Description = Comparative altitudes |Source = [http://www.archive.org/details/popularsciencemo53newy Popular Science Monthly Volume 53] |Date = 1898 |Author = Unknown |Permission = {{PD-old}} |other_versions =

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