http://dewey.info/scheme/edition/e23/ en
587 Pteridophyta
587.3 Polypodiopsida
587.33 Marattiales and Ophioglossales
http://dewey.info/scheme/edition/e22/ de
587 Pteridophyta (Farnpflanzen)
587.3 Polypodiopsida
587.33 Marattiales und Ophioglossales
Dewey Decimal Classification
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