http://dewey.info/scheme/edition/e23/ en
539.75 Nuclear activities and interactions
539.752 Natural radioactivity
539.7522 Alpha decay 539.7523 Beta decay 539.7524 Gamma decay
http://dewey.info/scheme/edition/e22/ de
539.75 Kernaktivitäten und Kernwechselwirkungen
539.752 Natürliche Radioaktivität
539.7522 Alphazerfall 539.7523 Betazerfall 539.7524 Gammazerfall
Dewey Decimal Classification
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