AMS series M841. Sheet 4103, Third Edition (A.E.F.). Copied from Netherland Topografische Inrichting 1:25,000 dated 1931-32 and Topografische Inrichting 1:50,000 dated 1932. Revised from air photographs from 1940, 1942 and 1943 in December 1944 by 21 A.Gp. Air Survey Group. Polyconic projection. Contour interval at 10 metres. Nord de Guerre Grid.
