Ionospheric research at Huancayo Observatory, Peru, January, 1938-June, 1946
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<p>Carnegie Institution of Washington publication 175, vol. XI</p><p></p>"Researches of the Department of Terrestrial Magnetism, vol. XI"
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<p>Carnegie Institution of Washington publication 175, vol. XI</p><p></p>"Researches of the Department of Terrestrial Magnetism, vol. XI"
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"<p>Carnegie Institution of Washington publication 175, vol. XI</p><p></p>"Researches of the Department of Terrestrial Magnetism, vol. XI""
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