00917nam0-2200289---450-99000964652040332120121120105647.0000964652FED01000964652(Aleph)000964652FED0100096465220121116d1961----km-y0itay50------baengNLa-------001yyURSI handbook of ionogram interpretation and reduction of the World Wide Soundings Committeeedited by W.Roy Piggot and K. RawerAmsterdamElsevier1961XI, 192 p.ill.24 cmPiggot,William RoyRawer,KarlITUNINARICAUNIMARCBK990009646520403321GM1 AB IV 262228GM1GM1URSI handbook of ionogram interpretation and reduction of the World Wide Soundings Committee840500UNINA