Alʹpert, IA. L. Propagation of ELF and VLF waves near the earth IA. L. Alʹpert and D. S. Fligel - New York Consultants Bureau 1970 - v+171p. figs; refs; tables ISBN: 306108364 Subjects--Topical Terms: Elf And Vlf WavesPropagation Of Elf & Vlf Waves Universal Decimal Class. No.: 551.510.535.4:621.372 / ALP