Hi There was an Internet site davidrumsey.com maps that Google found and I looked there but didn't see any Crestline. I have a reprint of De La Virginie Du Maryland by Pierre Jefferson 1755 and it has the settlers' towns. One is Chester on the eastern side of the Chesapeake Bay(and still part of Maryland today.) I think we call it Chesterton today. It looks like it might have been part of Talbot County. And Charles which I think is Charlestown today and it looks like it was part of Baltimore County at that time. There are only 12 or so marked settlers towns in Maryland.