GSGS series 4229. Second Edition (Coloured)-AMS 1. Copied from an Italian Istituto Geografico Militare map dated 1896 with principal communications revised up to 1939 from smaller scale maps. Photolithographed by the British Ordnance Survey in 1943 and revised from Air Photos. 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 (Blue).