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No. 1,685 — Seaton BurnTownship of Brenkley, Northumberland Sheet 80 of 19thC Ordnance Map. Lat. 55° 04' 10", Long. 1° 40' 27". [ OS Grid Ref: NZ 20805 75052 (420805,575052) ] No. 4 Borehole, half-way between No. 1 and No. 3 on North line Approximate surface level 207 feet above sea (Ordnance datum)
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