title: Fertility differentials within a subdivided population: a controlled comparison of four Sells Papago isolates.
mesh_terms: D000293:Adolescent; D000328:Adult; D001130:Arizona; D005006:Ethnicity; D005260:Female; D005298:Fertility; D006801:Humans; D007198:Indians, North American; D008875:Middle Aged; D012934:Social Isolation