http://dewey.info/scheme/edition/e23/ en
001.4 Research
001.42 Research methods
001.4202854678 Internet research 001.422 Statistical methods
http://dewey.info/scheme/edition/e22/ de
001.4 Forschung
001.42 Forschungsmethoden
001.4202854678 Forschung—Internet, . . . 001.422 Statistische Methoden
Dewey Decimal Classification
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