Trends in contraceptive practice: United States, 1965-76.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D003267:Contraception; D004522:Educational Status; D005191:Family Characteristics; D005260:Female; D006801:Humans; D008393:Marriage; D011247:Pregnancy; D044469:Racial Groups; D012067:Religion; D014481:United States