title: Differences in U.S. marital fertility, 1970--73, by planning status of births.
mesh_terms: D000293:Adolescent; D000328:Adult; D001741:Black or African American; D004522:Educational Status; D005193:Family Planning Services; D005260:Female; D005298:Fertility; D006801:Humans; D008393:Marriage; D011203:Poverty; D014481:United States; D014505:Urban Population; D044465:White People