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![PDF] Terrestrial propagation of very-low-frequency radio waves, a theoretical investigation | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/c7c5b7372b5cb402237c0ec57efce313829cb151/7-Figure3-1.png "PDF] Terrestrial propagation of very-low-frequency radio waves, a theoretical investigation | Semantic Scholar")
PDF] Terrestrial propagation of very-low-frequency radio waves, a theoretical investigation | Semantic Scholar
