G.S.G.S.; AMS 1. Great Britain. War Office. General Staff. Geographical Section. G.S.G.S. no. 4379. United States. Army Map Service. In upper left margin: Italy 1:5,000. Ancilllary map: Agrigento & Porto Empedocle (1:70,000). Relief shown by countours at 10 metres interval, and rock drawings. Enlarged from 1/23,000 Italian map dated 1931. Revised from air photographs and intelligence reports up to 1942. Photolitographed by the Ordnance Survey, 1943.
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