GSGS series 4228. Second Edition. Italian Istituto Geografico Militare map dated 1934 and revised from Air Photographs dated Oct. 1943. Revised and Reproduced by 514 Corps Fd. Svy. Coy., R.E., June 1944. 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.