title: Fertility, marriage, and occupation in the Pennsylvania anthracite region, 1850-1880.
authors.forename: M R
authors.initials: MR
authors.lastname: Haines
mesh_terms: D003710:Demography; D049711:History, Modern 1601-; D012098:Reproduction; D013223:Statistics as Topic / Q000266:history*; D014481:United States