1. VLF Radio Engineering;Watt,1967
2. Propagation of L.F. Electromagnetic Waves in the Earth Ionosphere Wave-Guide;Al'pert,1967
3. Special issue on the propagation of long radio waves.;Crombie;Radio Sci.,1967
4. Propagation of terrestrial radio waves of long wavelength.;Johler;J. Res. Natl. Bur. Std.,1962
5. Electromagnetic Waves in Stratified Media;Wait,1962