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Ionosphere --- Observations --- Periodicals. --- Observatorio del Ebro --- Heaviside layer --- Kennelly-Heaviside layer --- Patronato "Alfonso el Sabio." --- Roquetas, Spain. --- Consejo Superior de Investigaciones Científicas (Spain). --- Observatorio de Física Cósmica del Ebro --- Observatorio del Ebro-Tortosa --- Observatoire de l'Ebre --- Instituto Nacional de Geofísica (Spain). --- Colegio Máximo de la Compañía de Jesús de Tortosa. --- Observatori de l'Ebre --- Atmosphere, Upper --- Upper atmosphere