Keysville is an unincorporated community in Carroll County, Maryland, United States.[1] Terra Rubra was listed on the National Register of Historic Places in 1978.[2]
- ^ "Geographic Names Information System". Keysville (Populated Place). U.S. Geological Survey. January 29, 2009.
- ^ "National Register Information System". National Register of Historic Places. National Park Service. April 15, 2008.