http://dewey.info/scheme/edition/e23/ en
499.99 Afrihili (Artificial language)
499.992 Esperanto language
499.992800246 Esperanto language--technical Esperanto
http://dewey.info/scheme/edition/e22/ de
499.99 Afrihili (Kunstsprache), . . .
499.992 Esperanto
499.992800246 Esperanto--technisches Esperanto
Dewey Decimal Classification
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