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No. 488 — ChopwellTownship of Chopwell, Durham Sheet 5 of 19thC Ordnance Map. Lat. 54° 55' 33", Long. 1° 48' 30". [ OS Grid Ref: NZ 12282 59041 (412282,559041) ] Account of Strata sunk through at Conclusion Pit, Chopwell Colliery. June 20th, 1799 Approximate surface level 824 feet above sea (Ordnance datum)
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