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No. 717 — DerwentTownship of Gateshead, South Ward, Durham Sheet 6 of 19thC Ordnance Map. Lat. 54° 55' 49", Long. 1° 36' 16". [ OS Grid Ref: NZ 25344 59591 (425344,559591) ] Account of the Boring in the George Pit, Derwent Crook Colliery, from the Thill of Low Main Seam. 1819 Approximate surface level 105 feet above sea (Ordnance datum)
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