(W 77⁰32ʹ20ʺ--W 77⁰26ʹ40ʺ/N 39⁰44ʹ20ʺ--N 39⁰38ʹ00ʺ).
Relief shown by contours and spot heights.
"War Department, The Military Intelligence Training Center, Camp Ritchie, Maryland, June 1943."
Grid system is arbitrary.
Camp Ritchie was redesignated Fort Ritchie in 1948. On Oct. 1, 1998, Fort Ritchie was closed as an active Army installation as part of the 1995 Base Realignment and Closure Act.