GSGS series 4414. Sheet 4308, Second Edition (A.E.F.). First edition copied from German Topographisce Karte 1:25,000 Sheet 4308 dated 1931 and photolithograpged by the British Ordnance Survey in 1944. Second edition revised from air photographs October 1944 (521 R.E.). Lambert modified conical orthomorphic projection. Nord de Guerre Grid.
