http://dewey.info/scheme/e22/
500 Naturwissenschaften und Mathematik
500 Naturwissenschaften
500 Naturwissenschaften und Mathematik 501 Philosophie, Theorie 502 Verschiedenes 503 Wörterbücher, Enzyklopädien 505 Fortlaufende Sammelwerke 506 Organisationen, Management 507 Ausbildung, Forschung, verwandte Themen 508 Naturgeschichte 509 Histor., geogr., personenbezogene Behandlung
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