Middletown Valley Families of Maryland

I am researching many early German families who settled the Middletown Valley of Frederick County, MD.Most families arrived in the mid 1700's after leaving eastern PA.The namesare many, but mostly; Horine, Flook, Possert, Harp, Summers, Routzahn, Bowlus, Shank/Shenk, Engle, Wiles and related families.Will be glad to trade data.