@inbook{NBERc9506,
 Crossref = "NBERulme54-1",
 title = "Summary",
 author = "Melville J. Ulmer",
 BookTitle = "Trends and Cycles in Capital Formation by United States Railroads, 1970-1950",
 Publisher = "NBER",
 pages = "50-51",
 year = "1954",
 URL = "http://www.nber.org/chapters/c9506",
}
@book{NBERulme54-1,
 title = "Trends and Cycles in Capital Formation by United States Railroads, 1970-1950",
 author = "Melville J. Ulmer",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1954",
 URL = "http://www.nber.org/books/ulme54-1",
}