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No. 712 — DentonTownship of East Denton, Northumberland Sheet 97 of 19thC Ordnance Map. Lat. 54° 58' 34", Long. 1° 42' 12". [ OS Grid Ref: NZ 18987 64659 (418987,564659) ] Boring in the Yarmouth Pit, West Denton Colliery, from Thill of Denton Low Main Seam. March 1792 Approximate surface level feet above sea (Ordnance datum)
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