File:PSM V83 D391 Symmetrical tetrahedrons in the three dimensional concept.png

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English: Symmetrical tetrahedrons in the three dimensional concept
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Source Popular Science Monthly Volume 83
Author Unknown authorUnknown author

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current11:23, 24 August 2012Thumbnail for version as of 11:23, 24 August 20121,320 × 544 (28 KB)Ineuw (talk | contribs)User created page with UploadWizard

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