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No. 412 — Charlaw CollieryTownship of Witton Gilbert, Durham Sheet 19 of 19thC Ordnance Map. Lat. 54° 49' 16", Long. 1° 38' 13". [ OS Grid Ref: NZ 23325 47433 (423325,547433) ] Account of Strata sunk through to the Hutton Seam of the Witton Pit, in 1859 and 1860 Approximate surface level 498 feet above sea (Ordnance datum)
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