GSGS series 4228. Second Edition-AMS 1. Italian Istituto Geografico Militare map dated 1934 and photolithographed by the British Ordnance Survey in 1943. Reproduced under the direction of the Chief of Engineers by the Army Map Service (AM), U.S. Army, Washington, D.C., 1944 from AFHQ Second Edition 1943 (AF 3073), showing August 1943 aerial photo revision by 512 Field Survey Coy., R.E., of GSGS First Edition, 1943, which was copied from an Italian map dated 1934. 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.). North Italy Grid.