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The oldest and most universally practiced form of family planning now has a much-needed single source of authoritative information based on the latest research. This useful reference provides readers with increased awareness of the body's natural fertility processes, introducing proven techniques that help in achieving pregnancy when it has proved difficult or to avoid pregnancy safely, reliably, and without side-effects. Current guidelines for identifying the fertile and infertile phases of a woman's cycle are covered, including ovulation-menstrual rhythm, temperature rise following ovulation, rises in estrogen levels, and multiple indexes methods using these in combination. Charts and illustrations developed by leading teaching hospitals clarify each process. 192 pages, 60 b/w illus., 6 X 9 1/4.