http://dewey.info/scheme/e22/
500
Naturwissenschaften und Mathematik
540
Chemie
540
Chemie und zugeordnete Wissenschaften
541
Physikalische Chemie
542
Techniken, Ausstattung, Materialien
543
Analytische Chemie
546
Anorganische Chemie
547
Organische Chemie
548
Kristallografie
549
Mineralogie
Dewey Decimal Classification
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