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E. Keppler

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Messung von Röntgenstrahlung und Solaren Protonen mit Ballongeräten in der Nordlichtzone
X-Ray Measurements in the Auroral Zone from July to October 1964
X-Ray Measurements in the Auroral Zone from July to October 1964
Time Pattern of Ionizing Radiation in Balloon Altitudes in High Latitudes
Time Pattern of Ionizing Radiation in Balloon Altitudes in High Latitudes
Time Pattern of Ionizing Radiation in Balloon Altitudes in High Latitudes