File:PSM V06 D063 Tracing produced by walking upstairs.jpg

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Description Tracing produced by walking upstairs
Date between 1874 and 1875
date QS:P,+1874-00-00T00:00:00Z/8,P1319,+1874-00-00T00:00:00Z/9,P1326,+1875-00-00T00:00:00Z/9
Source Popular Science Monthly Volume 6
Author Unknown authorUnknown author
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current23:50, 1 July 2010Thumbnail for version as of 23:50, 1 July 20101,360 × 280 (22 KB)Ineuw{{Information |Description = Tracing produced by walking upstairs |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_6.djvu/63 |Date = 1874-1875 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} {{GFDL-user-w

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