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No. 1,059 — HartleyTownship of Hartley, Northumberland Sheet 81 of 19thC Ordnance Map. Lat. 55° 04' 45", Long. 1° 28' 16". [ OS Grid Ref: NZ 33762 76214 (433762,576214) ] Account of the Whin Pit, Hartley Colliery. By John and Robert Watson. August, 1754 Approximate surface level feet above sea (Ordnance datum)
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