Abstract
DURING the month of June, research work has been carried out at the Mammoth Cave, Kentucky, under the joint auspices of the United States Bureau of Mines and the Geological Survey of Canada, by permission of both of which this communication is being published. The disputed question of the extent to which wireless waves will penetrate into the earth has high scientific interest, and it bears directly on some practical modern methods of geophysical prospecting for underground conductors such as the sulphides of lead, iron, and copper.
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EVE, A., KEYS, D. & LEE, F. Penetration of Rocks by Electromagnetic Waves. Nature 124, 178–179 (1929). https://doi.org/10.1038/124178a0
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DOI: https://doi.org/10.1038/124178a0
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