Papal birth-control letter retains its grip.
D000028:Abortion, Induced; D001290:Attitude; D002410:Catholicism; D002977:Clergy; D003267:Contraception; D006801:Humans; D008393:Marriage; D019529:Sexuality; D012922:Social Change; D014481:United States
Genetics and Reproduction; Humanae Vitae; Popular Approach/Source; Religious Approach