http://dewey.info/scheme/edition/e23/ en
615.1 Drugs (Materia medica)
615.19 Pharmaceutical chemistry
615.19001 Philosophy and theory 615.19002 Miscellany 615.1901 Chemical analysis
http://dewey.info/scheme/edition/e22/ de
615.1 Arzneimittel (Materia medica)
615.19 Pharmazeutische Chemie
615.19001 Philosophie und Theorie 615.19002 Verschiedenes 615.1901 Chemische Analyse
Dewey Decimal Classification
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