@inbook{NBERc1957,
 Crossref = "NBERwill62-1",
 title = "Conclusions",
 author = "Ernest W. Williams, Jr.",
 BookTitle = "Freight Transportation in the Soviet Union, Including Comparisons with the United States",
 Publisher = "Princeton University Press",
 pages = "133-138",
 year = "1962",
 URL = "http://www.nber.org/chapters/c1957",
}
@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",
}