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No. 254 — BoldonTownship of Boldon, Durham Sheet 7 of 19thC Ordnance Map. Lat. 54° 57' 14", Long. 1° 27' 30". [ OS Grid Ref: NZ 34686 62281 (434686,562281) ] Strata sunk through in No. 1, or 12 feet diameter Upcast Shaft at Boldon Winning Approximate surface level 100 feet above sea (Ordnance datum)
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