Uadio waves will penetrate sCoft. or more of rock strata. This fact was discovered in teste conducted by the United States Bureau of Hines in a Colorado metal mine.
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Bibliographic details
Dominion, Volume 21, Issue 83, 6 January 1928, Page 9
Word Count
29Untitled Dominion, Volume 21, Issue 83, 6 January 1928, Page 9
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