<p>Doctor Billings, who researched and formulated the ovulation method, explains its use. A means of maintaining a clear personal record is also included.</p>

The Ovulation Method: Natural Family Planning

Parenting & Relationships

Billings, John J.

Family Relationships

Liturgical Pr

Gift of Life and Love: Love, Marriage and Natural Fertility Regulation

Religion & Spirituality

Catholic Truth Society

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Books by Billings, John J.