The surveyors Charles Mason and Jeremiah Dixon established the boundary line in 1767, which was to bear their names, resolving a dispute of nearly ninety years between the Penns and the Baltimores. The boundary, 244 miles in length, is printed on two sheets, the eastern line on a single copperplate, the western line, because of its length, divided into three parts, one engraved under the other. This copy belonged to Benjamin Chew (1722-1810), a member of the Boundary Commission established in 1750 by the English High Court.