. quarter of an inch of had will stoj rays, four inches will stop the gamron rays of radium, but 30 feet of lead are required to stop cosmic rays, the most iryalcrio'js and penetrating known to
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Bibliographic details
Hawke's Bay Tribune, Volume XXIV, Issue 233, 14 September 1934, Page 8
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36Untitled Hawke's Bay Tribune, Volume XXIV, Issue 233, 14 September 1934, Page 8
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