File:PSM V04 D691 Umbra and penumbra.jpg

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Description Umbra and penumbra
Date between 1873 and 1874
date QS:P,+1873-00-00T00:00:00Z/8,P1319,+1873-00-00T00:00:00Z/9,P1326,+1874-00-00T00:00:00Z/9
Source Popular Science Monthly Volume 4
Author Unknown authorUnknown author
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current00:23, 29 June 2010Thumbnail for version as of 00:23, 29 June 20101,980 × 858 (438 KB)Ineuw{{Information |Description = Umbra and penumbra |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_4.djvu/690 |Date = 1873-1874 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} {{GFDL-user-w|en|Wikisource|Ine

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