GSGS series 4228. Second Edition. Italian Istituto Geografico Militare map photolithographed by the British Ordnance Survey in 1943. Revised and reproduced by 13 Corps Fd. Svy. Coy., R.E., April 1944. The meridians are based on the meridian of Rome, which is 12 degrees, 27 minutes and 7.1 seconds east of Greenwich. North Italy Grid.
