Wait, James R Circular of the Bureau of Standards No. 574: Amplitude and Phase Curves for Ground-wave Propagation in the Band 200 Cycles per Second to 500 Kilocycles; NBS Circular 574

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Circular of the Bureau of Standards No. 574: Amplitude and Phase Curves for Ground-wave Propagation in the Band 200 Cycles per Second to 500 Kilocycles; NBS Circular 574