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No. 2,913 — Port ClarenceTownship of Billingham, Durham Sheet 51 of 19thC Ordnance Map. Lat. 54° 35' 45", Long. 1° 13' 12". [ OS Grid Ref: NZ 50390 22587 (450390,522587) ] Account of Strata passed through in the No. 1 Diamond Bore-hole on Salt Holme Farm, near Port Clarence, for Messrs. Bell Brothers, Limited, 1881 Approximate surface level 12 feet above sea (Ordnance datum)
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