Appendix A, Assigning Income and Unemployment Estimates to Individuals in the National Sample of the 1900 United States Census

Samuel H. Preston and Michael R. Haines, Fatal Years: Child Mortality in Late Nineteenth-Century America (Princeton University Press, 1991), https://www.nber.org/books-and-chapters/fatal-years-child-mortality-late-nineteenth-century-america/appendix-assigning-income-and-unemployment-estimates-individuals-national-sample-1900-united-states.