AMS series M841. Sheet 3602, Second Edition (A.E.F.). Copied from Netherland Topografische Inrichting 1:25,000 dated 1933-35 and Topografische Inrichting 1:50,000 dated 1932 and 1937. Revised from air photographs from 1940, 1941 and 1942 in October 1944 by the 21 A.Gp. Air Survey Group. Polyconic projection. Contour interval at 10 metres. Nord de Guerre Grid.
