AMS M791 (GSGS series 4229). Third Edition-AMS 2. Copied from an Istituto Geografico Militare map dated 1919. Revised from Air Photographs dated Oct -Nov. 1943. Revised and reproduced by 13 Corps Fd. Svy. Coy., R.E. Jan. 1944. Road classification is NOT based on reconnaissance, reliability is uncertain. The meridians are based on the meridian of Rome, which is 12 degrees, 27 minutes and 7.1 seconds east of Greenwich. Contours at 10 metres interval. South Italy Grid "Blue".