@inbook{NBERc2494,
 Crossref = "NBERlong60-1",
 title = "Front matter, Wages and Earnings in the United States 1860-1890",
 author = "Clarence D. Long",
 BookTitle = "Wages and Earnings in the United States, 1860-1890",
 Publisher = "Princeton University Press",
 year = "1960",
 URL = "http://www.nber.org/chapters/c2494",
}
@book{NBERlong60-1,
 title = "Wages and Earnings in the United States, 1860-1890",
 author = "Clarence D. Long",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1960",
 URL = "http://www.nber.org/books/long60-1",
}