@inbook{NBERc9693,
 Crossref = "NBERenge86-1",
 title = "Output and Productivity in Canadian Agriculture, 1870-71 to 1926-27",
 author = "R. M. McInnis",
 BookTitle = "Long-Term Factors in American Economic Growth",
 Publisher = "University of Chicago Press",
 pages = "737-778",
 year = "1986",
 URL = "http://www.nber.org/chapters/c9693",
}
@book{NBERenge86-1,
 title = "Long-Term Factors in American Economic Growth",
 author = "Stanley L. Engerman and Robert E. Gallman",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "University of Chicago Press",
 year = "1986",
 URL = "http://www.nber.org/books/enge86-1",
}