@inbook{NBERc5136,
 Crossref = "NBERfere29-1",
 title = "Statistics of Migrations, National Tables, Argentina, Brazil, Paraguay, Uruguay, Chile",
 author = "Walter F. Willcox",
 BookTitle = "International Migrations, Volume I: Statistics",
 Publisher = "NBER",
 pages = "537-582",
 year = "1929",
 URL = "http://www.nber.org/chapters/c5136",
}
@book{NBERfere29-1,
 title = "International Migrations, Volume I: Statistics",
 author = "Walter F. Willcox",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1929",
 URL = "http://www.nber.org/books/fere29-1",
}