Ionospheric research at Huancayo Observatory, Peru, January, 1938-June, 1946
by Carnegie Institution of Washington. Dept. of Terrestrial Magnetism.

<p>Carnegie Institution of Washington publication 175, vol. XI</p><p></p>"Researches of the Department of Terrestrial Magnetism, vol. XI"
Upper AtmosphereIonosphere--Peru--ObservationsAtmosphere, Upper