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Mentzer, Robert (August 2003). "How Mason & Dixon Ran Their Line"(PDF). Professional Surveyor Magazine. Архивировано из оригинала(PDF) 7 января 2014. Дата обращения: 3 августа 2021.
Mentzer, Robert (August 2003). "How Mason & Dixon Ran Their Line"(PDF). Professional Surveyor Magazine. Архивировано из оригинала(PDF) 7 января 2014. Дата обращения: 3 августа 2021.