1. A plan of the boundary lines between the Province of Maryland and the three lower counties on Delaware, with part of the parallel of latitude which is the boundary between the provinces of Maryland and Pennsylvania Maps University Of Minnesota Public content 1900. Mason, Charles, 1728-1786. Shows the northern part of the Mason and Dixon line.; Originally published with: A plan of the west line, or parallel of latitude, which is the bou... Maryland Historical Society (Baltimore, Md).