@inbook{NBERc1046,
 Crossref = "NBERunkn58-2",
 title = "Front matter",
 author = "Conference on Research in Income and Wealth",
 BookTitle = "An Appraisal of the 1950 Census Income Data",
 Publisher = "Princeton University Press",
 year = "1958",
 URL = "http://www.nber.org/chapters/c1046",
}
@book{NBERunkn58-2,
 title = "An Appraisal of the 1950 Census Income Data",
 author = "Conference on Research in Income and Wealth",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1958",
 URL = "http://www.nber.org/books/unkn58-2",
}