00554     2200145   4500001002100000008004100021035002000062245010000082260005500182300006700237084002300304082002300327650004000350990001800390INLIS000000000037161                                   Eng    a0010-0324022116  aConference on tropospheric wave propagationcLondon: Institution of Electrical Engineers, c1968  bLondon: Institution of Electrical Engineers, c1968  avii, 251 hal. : ilus. ; 30 cm.cvii, 251 hal. : ilus. ; 30 cm.  aR 621.381 31 Con c  aR 621.381 31 Con c  aTropospheric radio wave propagation  a3100087011795