AMS series M841. Sheet 3102, Second Edition (A.E.F.). Copied from Netherland Topografische Inrichting 1:25,000 dated 1933-34 and Topografische Inrichting 1:50,000 dated 1932. Revised from air photographs from 1941 and 1943 in November 1944 (I RCE). Polyconic projection. Contour interval at 10 metres. Nord de Guerre Grid.