http://dbpedia.org/resource/Ionosphere +
, http://dbpedia.org/resource/Skylab +
, http://dbpedia.org/resource/Jeanette_Scissum +
, http://dbpedia.org/resource/Venus +
, http://dbpedia.org/resource/Fred_Hoyle +
, http://dbpedia.org/resource/Neutron_monitor +
, http://dbpedia.org/resource/Hale%27s_law +
, http://dbpedia.org/resource/Sporadic_E_propagation +
, http://dbpedia.org/resource/Faraday_effect +
, http://dbpedia.org/resource/Citizens_band_radio +
, http://dbpedia.org/resource/Astrochronology +
, http://dbpedia.org/resource/80-meter_band +
, http://dbpedia.org/resource/Index_of_radio_propagation_articles +
, http://dbpedia.org/resource/Transequatorial_loop +
, http://dbpedia.org/resource/Over-the-horizon_radar +
, http://dbpedia.org/resource/Frank_Hill_%28scientist%29 +
, http://dbpedia.org/resource/Ross_128 +
, http://dbpedia.org/resource/John_Lawrence_Daly +
, http://dbpedia.org/resource/TV_and_FM_DX +
, http://dbpedia.org/resource/Apex_%28radio_band%29 +
, http://dbpedia.org/resource/Radio_propagation +
, http://dbpedia.org/resource/Toronto_Magnetic_and_Meteorological_Observatory +
, http://dbpedia.org/resource/Astronomy +
, http://dbpedia.org/resource/11_%28number%29 +
, http://dbpedia.org/resource/Heinrich_Schwabe +
, http://dbpedia.org/resource/A._E._Douglass +
, http://dbpedia.org/resource/Radiative_forcing +
, http://dbpedia.org/resource/W4XA +
, http://dbpedia.org/resource/Gustav_Sp%C3%B6rer +
, http://dbpedia.org/resource/Soft_error +
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