551.51 Composition, regions, dynamics of atmosphere
551.514 Upper atmosphere
551.5142 Stratosphere 551.5145 Ionosphere de
551.51 Zusammensetzung, Regionen, Dynamik der Atmosphäre
551.514 Obere Atmosphäre
551.5142 Stratosphäre 551.5145 Ionosphäre
Dewey Decimal Classification
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