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No. 180 — Bigges MainTownship of Wallsend, Northumberland Sheet 89 of 19thC Ordnance Map. Lat. 54° 59' 49", Long. 1° 33' 06". [ OS Grid Ref: NZ 28679 67029 (428679,567029) ] Strata sunk through from the surface to the High Main Coal Approximate surface level 130 feet above sea (Ordnance datum)
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