Natural Family Planning: The...
John F Kippley
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Signs of Fertility: The...
Margaret Nofziger
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The Billings Method:...
Evelyn Billings
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Signs of Fertility: The...
Margaret Nofziger
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Billings Method: Controlling...
Evelyn Billings,
Ann Westmore
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The Ovulation Method of...
Thomas W. Hilgers
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The Medical Applications of...
Thomas W Hilgers
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The Billings Method of...
Evelyn Billings,
Ann Westmore
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The Billings Method:...
Evelyn Billings
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The Billings Method:...
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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...
Mercedes A Wilson
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The Billings method :...
Evelyn Billings,
Ann Westmore
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Avoid or achieve pregnancy...
Terrie Guay,
Annie Conaway
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