Vintage Natural Birth Control Guide Book The Rhythm Method Menstrual Cycle

Vintage Natural Birth Control Guide Book The Rhythm Method Menstrual Cycle Vintage “Guide Book — Natural Birth Control: The Rhythm Method”, an historical guide devoted to the calendar/rhythm method of natural birth control and menstrual-cycle planning. The booklet contains detailed monthly charts covering menstrual cycles ranging from 20–24 days through 33–37 days, with instructions for determining fertile and “safe” periods based on the date menstruation begins. The book is approximately 168 pages and includes an index and monthly cycle tables.

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