http://dewey.info/scheme/edition/e23/ en
577.5 Ecology of miscellaneous environments
577.53 Mountain ecology
577.538 Alpine ecology
http://dewey.info/scheme/edition/e22/ de
577.5 Ökologie verschiedener Lebensräume
577.53 Ökologie von Gebirgen
577.538 Ökologie oberhalb der Baumgrenze
Dewey Decimal Classification
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