GSGS series 4227, sheet 35, edition 2, copy no. 2527. This is a "Going Overprint" map utilizing the colour scheme to denote varying levels of terrain trafficability with mechanised forces. "Going" information collected by Long Range Desert Group and special reconnaissance units. Copied from a French map dated 1928, with revision to communications from Intelligence Reports of 1941. Reproduced by 512 Fd. Survey Coy., R.E., November 1942 from War Office pulls of 2nd edition, 1942. Reprinted by 512 Fd. Survey Coy., R.E., January 1943. Going overprinted by 512 Fd. Survey Coy., R.E., February 1943. Copy number 2527. Location: Lloyd Reeds Map Collection call no. G