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The Mason-Dixon Line is 250 years old - but who were the two British men who created one of America's most famous land borders?
On the border between Maryland and Pennsylvania, a team of volunteer surveyors work diligently to preserve both the markers and the history of the Mason-Dixon Line.
The Mason-Dixon Line is 250 years old - but who were the two British men who created one of America's most famous land borders?
The Mason-Dixon Line is 250 years old - but who were the two British men who created one of America's most famous land borders?
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