AMS series M841. Sheet 3403, First Edition-AMS 1. Copied from Netherland Topografische Inrichting 1:25,000 dated 1932-33 and Topografische Inrichting 1:50,000 dated 1934. Revised from air photographs from 1941, 1942 and 1943. Polyconic projection. Contour interval at 10 metres. Nord de Guerre Grid.