@inbook{NBERc11548,
 Crossref = "NBERpres91-1",
 title = "Appendix B, The State Earnings Index",
 author = "Samuel H. Preston and Michael R. Haines",
 BookTitle = "Fatal Years: Child Mortality in Late Nineteenth-Century America",
 Publisher = "Princeton University Press",
 pages = "221-225",
 year = "1991",
 month = "January",
 URL = "http://www.nber.org/chapters/c11548",
}
@book{NBERpres91-1,
 title = "Fatal Years: Child Mortality in Late Nineteenth-Century America",
 author = "Samuel H. Preston and Michael R. Haines",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1991",
 URL = "http://www.nber.org/books/pres91-1",
}