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No. 217 — Black CloseTownship of North Seaton, Northumberland Sheet 65 of 19thC Ordnance Map. Lat. 55° 10' 05", Long. 1° 33' 37". [ OS Grid Ref: NZ 28008 86065 (428008,586065) ] Account of the Borings at Black Close, 40 yards West of the Old Engine. August 29th, 1785 Approximate surface level 50 feet above sea (Ordnance datum)
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