File:Voyage in Space page025.png
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Size of this preview: 417 × 599 pixels. Other resolutions: 167 × 240 pixels | 334 × 480 pixels | 775 × 1,113 pixels.
Original file (775 × 1,113 pixels, file size: 46 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 11:26, 19 December 2015 | 775 × 1,113 (46 KB) | Keith Edkins | {{Information |Description={{en|1=Discussion of the principle that the gravitational attraction of the earth acts as if from its centre.}} |Source=A Voyage in Space[https://archive.org/details/voyageinspacecou00turnrich]. |Author=Herbert Hall Turner |... |
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