"Simple methods" and "determined contraceptors": the statistical evaluation of fertility control, 1957-1968.
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D003268:Contraception Behavior / Q000266:history* / Q000706:statistics & numerical data; D003274:Contraceptive Devices, Female / Q000266:history* / Q000706:statistics & numerical data; D005193:Family Planning Services / Q000266:history* / Q000706:statistics & numerical data; D049673:History, 20th Century; D006801:Humans; D007434:Intrauterine Devices / Q000266:history / Q000706:statistics & numerical data; D014481:United States