@inbook{NBERc12332,
 Crossref = "NBERferr99-1",
 title = "Appendix D: Imputing Income by Occupation",
 author = "Joseph P. Ferrie",
 BookTitle = "Yankeys Now: Immigrants in the Antebellum U.S. 1840-1860",
 Publisher = "Oxford University Press",
 pages = "203-208",
 year = "1999",
 month = "January",
 URL = "http://www.nber.org/chapters/c12332",
}
@book{NBERferr99-1,
 title = "Yankeys Now: Immigrants in the Antebellum U.S. 1840-1860",
 author = "Joseph P. Ferrie",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Oxford University Press",
 year = "1999",
 URL = "http://www.nber.org/books/ferr99-1",
}