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No. 2,531 — ChopwellTownship of Chopwell, Durham Sheet 5 of 19thC Ordnance Map. Lat. 54° 55' 25", Long. 1° 49' 05". [ OS Grid Ref: NZ 11660 58792 (411660,558792) ] Account of Strata bored through on Bolam's Farm, Chopwell Royalty, over the 20 Fathoms Dyke. Commenced November 8th, 1886 Approximate surface level 650 feet above sea (Ordnance datum)
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