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Radio propagation measurements in coal mines at UHF and VHF
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Colorado School of Mines, Golden, Colo., Aug, 15–17, available from Nat. Tech. Inform. Service, Alexandria, Va.
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A. E. Goddard, “Radio propagation measurements in coal mines at UHF and VHF,” in Proc. Through-the-Earth Electrornagnetics Workshop, Colorado School of Mines, Golden, Colo., Aug, 15–17, 1973, available from Nat. Tech. Inform. Service, Alexandria, Va.
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Mine communications
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Bureau of Mines Information Circular/1974, IC-8635, Bruceton, Pa., Mar. 21–22
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