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No. 4 — AcklingtonTownship of Hadstone, Northumberland Sheet 46 of 19thC Ordnance Map. Lat. 55° 17' 50", Long. 1° 35' 58". [ OS Grid Ref: NU 25431 00423 (425431,600423) ] Fourth Borehole, 120 yards S.E. from No. 3 Approximate surface level 70 feet above sea (Ordnance datum)
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