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Cassini's enhanced reproductions of historic Ordnance Survey maps are an invaluable resource for local historians, genealogists and social scientists. The maps have been carefully scanned, digitally re-projected and enlarged to the equivalent modern scale. Centred on a city or town and covering 15km x 15km, each of the sheets in the Past and Present series comprises four OS maps of the same area from the mid and late 19th century, the 1920s and the present. Scale 1:50,000.