title: Reflections on replacement.
authors.affiliation: Office of Population Research, Princeton University, N.J.
authors.forename: N B
authors.initials: NB
authors.lastname: Ryder
mesh_terms: D005191:Family Characteristics; D016656:Family Planning Policy; D005260:Female; D005298:Fertility; D005544:Forecasting; D005783:Gender Identity; D006801:Humans; D008297:Male; D011157:Population Dynamics; D012922:Social Change; D014481:United States; D014931:Women, Working