Periodic fertility and sterility in woman : a natural method of birth control / by Hermann Knaus ; authorized English translation by D.H. Kitchin and Kathleen Kitchin.

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Kitchen, D. H. (Derek Harcourt)

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Periodic fertility and sterility in woman : a natural method of birth control / by Hermann Knaus ; authorized English translation by D.H. Kitchin and Kathleen Kitchin.