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No. 868 — FellingTownship of Heworth, Durham Sheet 7 of 19thC Ordnance Map. Lat. 54° 57' 15", Long. 1° 34' 21". [ OS Grid Ref: NZ 27375 62261 (427375,562261) ] An Account of a Boring in the John Pit, from the Thill of the Low Main Seam to the Beaumont Seam, July 6th, 1840 Approximate surface level 120 feet above sea (Ordnance datum)
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