1. White Oak Canyon at Nigger Run Fork, Skyline Drive, Va. Creator: Marken & Bielfeld, Inc. (Frederick, Md.) Date: June 25, 1989 Format: Still image Access: Public
2. Braddock's Spring, Braddock Heights, Md. Creator: Marken & Bielfeld, Inc. (Frederick, Md.) Date: unknown Format: Still image Access: Public