. "Frederick County"@en . "History of location is unknown."@en . . . . "Frederick County is a county located in Maryland. The Black Hills are is located here. The Black Hills Forest was the last known location of film students Heather Donahue, Joshua Leonard and Michael Williams."@en . . "* Camp David"@en . . . "Frederick County is a county located in Maryland. The Black Hills are is located here. The Black Hills Forest was the last known location of film students Heather Donahue, Joshua Leonard and Michael Williams."@en . "Frederick County"@en . . . "Milky Way"@en . "United States"@en . . "History of location is unknown."@en . "Maryland"@en . "Sol"@en . . "Earth"@en .