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Billings Method: Controlling...
Evelyn Billings,
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The Ovulation Method of...
Thomas W. Hilgers
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The Billings Method of...
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The Billings Method:...
Dr Evelyn Billings and Ann Westmore
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Ovulation Method of Birth...
Mercedes Arzu Wilson
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The Ovulation Method of Birth...
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The Billings method :...
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Natural Sex
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Avoid or achieve pregnancy...
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