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The Ordnance Survey took particular care in plotting the south coast of England, as this was the area most immediately vulnerable to invasion. This plan notes military barracks at Selsea, Aldwick and Bognor to the bottom right of the plan. Buildings are blocked in red and black ink and infilled at Chichester, in the centre of the plan, and Arundel, at the right. A poor house and pest house are located a considerable distance beyond the boundaries of Chichester.