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- [33] THE PROPAGATION OF VERY LOW FREQUENCY RADIO WAVES TO GREAT DISTANCES PHILOSOPHICAL MAGAZINE, 1953, 44 (352): : 504 - 513
- [34] THE IONOSPHERIC PROPAGATION OF RADIO WAVES OF FREQUENCY 16KC/S OVER DISTANCES OF ABOUT 200 KM PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON, 1952, 99 (03): : 217 - 228