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 Up to and including 1880 the country had a frontier of settlement, but at present the unsettled area has been so broken into by isolated bodies of settlement that there can hardly be said to be a frontier line.  Measuring America: The Decennial Censuses from 1790 to 2000 - Halaman 122 oleh Jason G. Gauthier - 2002 - 140 halaman Tampilan utuh -
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