Twin Cities Natural Family Planning Center
Information on Ovulation Method, human fertility cycles, and other non-chemical approaches to family planning.
Web Womb
Fertility indicator and pregnancy tests. Information on the Fertility Awareness Method. Product, contact information and charts.
World Organization Ovulation Method Billings
Covers the Billings Ovulation Method of natural family planning, research papers and teaching material, identifies teach locations in over 100 countries.
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