613.943
H361C
           Hatchor, Robert A
               Contraceptive technology (1976-1977) \ Robert A Hatchor - 8th rev - New York : Irvington, 1976.
               144p+tab+ fig
                ISBN: 0-470-15228-1

96768
                Subjects: Conception-Prevention; Birth control; Family size; contraceptives; Menstrual cycle.