http://dewey.info/scheme/edition/e23/ en
551.514 Upper atmosphere
551.5145 Ionosphere
551.51450284 Ionosphere--meteorology--equipment 551.5145099922 Venus (Planet)--ionosphere--meteorology 551.5145099923 Mars (Planet)--ionosphere--meteorology
http://dewey.info/scheme/edition/e22/ de
551.514 Obere Atmosphäre
551.5145 Ionosphäre
551.51450284 Ionosphäre—Meteorologie—Ausstattung 551.5145099922 Venus (Planet)—Ionosphäre—Meteorologie 551.5145099923 Mars (Planet)—Ionosphäre—Meteorologie
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