http://dewey.info/scheme/edition/e23/ en
616.85884 Mental retardation due to genetic disorders, other congenital abnormalities
616.858842 Down syndrome
http://dewey.info/scheme/edition/e22/ de
616.85884 Mentale Retardierung durch genetische Störungen, durch andere angeborene Anomalien
616.858842 Down-Syndrom
Dewey Decimal Classification
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