Differential fertility in the United States: 1976-1980.
D000293:Adolescent; D000328:Adult; D004522:Educational Status; D005006:Ethnicity; D005260:Female; D005298:Fertility; D006801:Humans; D007182:Income; D008423:Maternal Age; D011247:Pregnancy; D012111:Residence Characteristics; D014481:United States; D014798:Vital Statistics