@inbook{NBERc1959,
 Crossref = "NBERwill62-1",
 title = "Appendix A: Railroad Performance vs. Capital Investments During the Transportation Crisis in the USSR, 1931-35 ",
 author = "Ernest W. Williams, Jr.",
 BookTitle = "Freight Transportation in the Soviet Union, Including Comparisons with the United States",
 Publisher = "Princeton University Press",
 pages = "141-156",
 year = "1962",
 URL = "http://www.nber.org/chapters/c1959",
}
@book{NBERwill62-1,
 title = "Freight Transportation in the Soviet Union, Including Comparisons with the United States",
 author = "Ernest W. Williams, Jr.",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Princeton University Press",
 year = "1962",
 URL = "http://www.nber.org/books/will62-1",
}