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Ty's Commons' digitally-enhanced derivative of a public domain map by W. & A.K. Johnston (William Johnston (1802-1888), Lord Provost of Edinburgh, and Alexander Keith Johnston (1804-1871), Geographer-Royal for Scotland); maps published in Historical Atlas of Modern Europe from the Decline of the Roman Empire by Reginald Lane Poole (1857-1939), Keeper of the Archives, University of Oxford (published by Clarendon Press, London, Edinburgh and New York 1902); Historical Atlas of Modern Europe from the Decline of the Roman Empire
