GSGS series 4228. Second Edition (Coloured)-AMS 3. Italian Istituto Geografico Militare map dated 1931 and photolithographed by the British Ordnance Survey in 1942. Partially revised for communications 1942. Prepared under the direction of the Chief of Engineers, U.S. Army, by Army Map Service, San Antonio Branch, 1943. Revised from aerial photos. The meridians are based on the meridian of Rome, which is 12 degrees, 27 minutes and 7.1 seconds east of Greenwich. Contours at 25 metres (V.I.). South Italy Zone Grid "Blue".