http://dewey.info/scheme/edition/e23/ en
027 General libraries, archives, information centers
027.1 Private and family libraries
027.109 History and biography
http://dewey.info/scheme/edition/e22/ de
027 Allgemeinbibliotheken, Archive, Informationszentren
027.1 Privat- und Familienbibliotheken
027.109 Geschichte und Biografien
Dewey Decimal Classification
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