@inbook{NBERc9220,
 Crossref = "NBERchud45-1",
 title = "Appendix E, Classification of Industries by Major and Minor Industrial Groups",
 author = "Walter A. Chudson",
 BookTitle = "The Pattern of Corporate Financial Structure: A Cross-Section View of Manufacturing, Mining, Trade, and Construction, 1937",
 Publisher = "NBER",
 pages = "140-142",
 year = "1945",
 URL = "http://www.nber.org/chapters/c9220",
}
@book{NBERchud45-1,
 title = "The Pattern of Corporate Financial Structure: A Cross-Section View of Manufacturing, Mining, Trade, and Construction, 1937",
 author = "Walter A. Chudson",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1945",
 URL = "http://www.nber.org/books/chud45-1",
}