Abstract
IN a recent letter to NATURE (July 2) by two of the present writers, it was pointed out that information was lacking as to the extent to which radio waves could penetrate the earth. By the courtesy of Mr. J. H. Clark, Mr. H. K. Lidstone, and other officials of the famous Caribou Mine, Colorado, an opportunity was offered on Aug. 17 to make some satisfactory tests on this point.
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EVE, A., KEYS, D. & DENNY, E. Penetration of Radio Waves. Nature 120, 406 (1927). https://doi.org/10.1038/120406a0
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DOI: https://doi.org/10.1038/120406a0
