Family of the Americas
Proposes natural method for achieving or postponing pregnancy.
www.familyplanning.net
WOOMB Canada
Organization which promotes the Billings Ovulation Method in accordance with the philosophy of Humanae Vitae.
www.woomb.ca
Ovulation Method Research and Reference Centre of Australia
Offers information on fertility, Billings Ovulation Method of natural family planning, cycle variations, teaching, trials, and research papers.
www.billings-ovulation-method.org.au
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