http://dewey.info/scheme/edition/e23/ en
539 Modern physics
539.1 Structure of matter
539.12 Molecular structure 539.14 Atomic structure
http://dewey.info/scheme/edition/e22/ de
539 Moderne Physik
539.1 Struktur von Materie
539.12 Molek├╝lstruktur 539.14 Atomare Struktur
Dewey Decimal Classification
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