The Mason–Dixon line was marked by stones every mile and "crownstones" every , using stone shipped from England. The Maryland side says "(M)" and the Delaware and Pennsylvania sides say "(P)". Crownstones included both coats of arms.
the mason–dixon line was marked by stones every mile and "crownstones" every  using stone shipped from england the maryland side says "(m)" and the delaware and pennsylvania sides say "(p)" crownstones included both coats of arms