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such as optimism
sehen die Unternehmen in diesem Medium neue Chancen
The Prediction of Ionospheric Conditions 53 ihre Richtung und ihren InhaltThe ionosphere of the Earth has been actively studied since the 1920's, following the discovery of ground radio sounding. By means of this method results were ohtained by an international network of ionospheric stations, in particular, by the successful implementation of a number of rigorously planned international scientific research programs,'" enabling the collection of extensive experimental material on some of the most important parameters of the
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