http://dewey.info/scheme/edition/e23/ en
613.9 Birth control, reproductive technology, sex hygiene, sexual techniques
613.94 Birth control and reproductive technology
613.942 Surgical methods of birth control 613.943 Chemical, natural, mechanical methods of birth control
http://dewey.info/scheme/edition/e22/ de
613.9 Geburtenregelung, Reproduktionstechnik, Sexualhygiene
613.94 Geburtenregelung und Fortpflanzungstechnologie
613.942 Chirurgische Methoden der Geburtenregelung 613.943 Chemische, natürliche, mechanische Methoden der Geburtenregelung
Dewey Decimal Classification
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