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No. 491 — ChopwellTownship of Chopwell, Durham Sheet 5 of 19thC Ordnance Map. Lat. 54° 55' 24", Long. 1° 49' 31". [ OS Grid Ref: NZ 11197 58761 (411197,558761) ] Account of Boring in Chopwell Estate, about 100 yards South-east from Ash Tree Farm House, December 18th, 1809 Approximate surface level 730 feet above sea (Ordnance datum)
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