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This little volume is planned to supply the public's desire for an outline of the so-called fertile and sterile periods of marriage. Dr. Pedersen discusses the Ogino-Knaus researches and indicates their practical application.
Nature's Way: The Fertile and Sterile Periods of Marriage. JAMA. 1935;104(17):1548. doi:10.1001/jama.1935.02760170086043