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No. 2,613 — Cowpon MarshTownship of Billingham, Durham Sheet 51 of 19thC Ordnance Map. Lat. 54° 36' 25", Long. 1° 12' 50". [ OS Grid Ref: NZ 50771 23828 (450771,523828) ] Account of Strata passed through in No. 3 Diamond Bore-hole put down on Copwon Marsh by Mr. John Vivian for the Newcastle Chemical Works Company, Limited, 1885 Approximate surface level 12 feet above sea (Ordnance datum)
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