AMS 1 Great Britain. War Office. General Staff. Geographical Section. G.S.G.S. no. 4379 United States. Army Map Service In upper left margin: Sicily 1:5,000. Contours at 10 metres. V.I. Source: Italy 1:25,000 G.S.G.S. no. 4228. Sheet 276 IV N.W.,1941. Italy 1:100,000 G.S.G.S. no. 4164. Sheet 276, 1942. Intelligence information 1943. Air photographs have been used in the production of this plan.