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 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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