@inbook{NBERc5706,
 Crossref = "NBERunkn49-1",
 title = "The Changing Industrial Distribution of Gainful Workers: Comments on the Decennial Statistics, 1820-1940",
 author = "Solomon Fabricant",
 BookTitle = "Studies in Income and Wealth",
 Publisher = "NBER",
 pages = "1-45",
 year = "1949",
 URL = "http://www.nber.org/chapters/c5706",
}
@book{NBERunkn49-1,
 title = "Studies in Income and Wealth",
 author = "Martha Anderson",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1949",
 URL = "http://www.nber.org/books/unkn49-1",
}