GSGS series 4229. Fourth Edition. Copied from an Italian Istituto Geografico Militare map dated 1895. Photolithographed by the British Ordnance Survey in 1943. 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 (V.I.). South Italy Grid.