@inbook{NBERc7064,
 Crossref = "NBERuniv65-2",
 title = "Manpower in Operating Classifications on the Railroads",
 author = "John L. Dunlop",
 BookTitle = "Transportation Economics",
 Publisher = "UMI",
 pages = "423-438",
 year = "1965",
 URL = "http://www.nber.org/chapters/c7064",
}
@book{NBERuniv65-2,
 title = "Transportation Economics",
 author = "Rendigs Fels, Chairman, Chairman, Universities-National Bureau Committee for Economic Research",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "UMI",
 year = "1965",
 URL = "http://www.nber.org/books/univ65-2",
}