GSGS series 4414. Sheet 4206, Third Edition (A.E.F.). Copied from German Topographisce Karte 1:25,000 Sheet 4206 dated 1926. Revised from air photographs Dec. '44 by 21 A. Gp Air Svy Gp. Lambert conical orthomorphic projection. Nord de Guerre Grid.
Downloads available under Creative Commons Attribution-NonCommercial 2.5 License