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No. 1,314 — MainsforthTownship of Mainsforth, Durham Sheet 35 of 19thC Ordnance Map. Lat. 54° 40' 39", Long. 1° 31' 21". [ OS Grid Ref: NZ 30786 31499 (430786,531499) ] An Account of Strata sunk through in the B or 14 feet diameter Pit, at Mainsforth Colliery Approximate surface level 275 feet above sea (Ordnance datum)
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