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No. 2,933 — Seaton DelavalTownship of Horton, Northumberland Sheet 81 of 19thC Ordnance Map. Lat. 55° 06' 00", Long. 1° 32' 21". [ OS Grid Ref: NZ 29403 78501 (429403,578501) ] Account of Strata sunk through in the Relief Pit, Seaton Delaval Colliery, 1884-1885 Approximate surface level 80 feet above sea (Ordnance datum)
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