United States. Children's Bureau and Dempsey, Mary V. (Mary Veronica), 1888-. Infant Mortality : Results of a Field Study in Brockton, Mass. Based on Births in One Year, Infant Mortality Series No. 8, Bureau Publication No. 37 , Washington, D.C: Government Printing Office, 1919, https://fraser.stlouisfed.org/title/8329, accessed on October 14, 2025.