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Berkner LV, 1937, TERR MAGN ATMOS ELEC, P183
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Booker H. G., 1935, PROC ROY SOC A, V150, P267
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THE IONOSPHERIC PROPAGATION OF LOW-FREQUENCY AND VERY-LOW-FREQUENCY RADIO WAVES OVER DISTANCES LESS THAN 1000 KM
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FARMER FT, 1936, THESIS CAMBRIDGE U
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THE PHASE AND GROUP PATHS OF RADIO WAVES RETURNED FROM REGION-E OF THE IONOSPHERE
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