00592nam a2200157Ia 4500003000900000008004100009040001600050080001900066110004000085245011700125260005000242300000900292490006300301650004100364650002900405IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a551.510.5bINT  aThe Inter Service Ionosphere Bureau 0aFundamental principles of ionospheric transmissioncThe Inter Service Ionosphere Bureau                           aLondonbHer Majesty's Stationary Officec1948  a81p.  aDepartment of scientific and industrial research admiralty  aAstronomy and Astrophysics Thesaurus  aIonospheric Transmission