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No. 23 — AshingtonTownship of Bothal, Northumberland Sheet 64 of 19thC Ordnance Map. Lat. 55° 11' 05", Long. 1° 36' 37". [ OS Grid Ref: NZ 24813 87900 (424813,587900) ] Strata bored through half a mile direct rise from Portland Pit, Ashington Colliery, March 13th, 1859 Approximate surface level 120 feet above sea (Ordnance datum)
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