@inbook{NBERc5488,
 Crossref = "NBERbarg42-2",
 title = "Appendix E: Industrial Classification",
 author = "Harold Barger",
 BookTitle = "Outlay and Income in the United States, 1921-1938",
 Publisher = "NBER",
 pages = "349-353",
 year = "1942",
 URL = "http://www.nber.org/chapters/c5488",
}
@book{NBERbarg42-2,
 title = "Outlay and Income in the United States, 1921-1938",
 author = "Harold Barger",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1942",
 URL = "http://www.nber.org/books/barg42-2",
}