File:PSM V82 D532 First and then helium appears during second bombardment.png

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English: First and then helium appears during second bombardment
Date
Source Popular Science Monthly Volume 82
Author Unknown authorUnknown author

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current00:44, 15 August 2012Thumbnail for version as of 00:44, 15 August 20121,334 × 963 (406 KB)Ineuw (talk | contribs)

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