PERIODIC CONTINENCE IN MARRIAGE. According to the principles of Knaus, Ogino and Smulders. Krempel, A.

PERIODIC CONTINENCE IN MARRIAGE. According to the principles of Knaus, Ogino and Smulders. Krempel, A.

Editorial	Herder
Edition	Barcelona, 1957
Binding	soft cover
Condition	Good
pages	127
Ref.	6D2000009

Includes calculation table for 30 periods. Sexuality. Natural methods of birth control. Natural contraceptive methods.

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PERIODIC CONTINENCE IN MARRIAGE. According to the principles of Knaus, Ogino and Smulders. Krempel, A.

PERIODIC CONTINENCE IN MARRIAGE. According to the principles of Knaus, Ogino and Smulders. Krempel, A.