During the second half of the 18th century, Frederick County bounded more land than any other county in Provincial Maryland, fully 551,273 acres. It encompassed all of the current counties of Frederick, Garrett, Allegany, Washington, and Montgomery and parts of Howard and Carroll, and some land in Pennsylvania prior to the drawing of the Mason-Dixon Line (1763/1767). These facts go a long way to explain why the Frederick County coverage in Vernon...