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BALLOON OBSERVATIONS OF X-RAYS IN THE AURORAL ZONE .1.
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BALLOON OBSERVATIONS OF X-RAYS IN THE AURORAL ZONE-II
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BALLOON OBSERVATIONS OF AURORAL-ZONE XRAYS
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THE NONDEVIATIVE ABSORPTION OF HIGH-FREQUENCY RADIO WAVES IN AURORAL LATITUDES
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ON HEIGHT DISTRIBUTION OF RATIO OF NEGATIVE ION AND ELECTRON DENSITIES IN LOWEST IONOSPHERE
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