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No. 2,430 — BirtleyTownship of Birtley, Durham Sheet 13 of 19thC Ordnance Map. Lat. 54° 53' 44", Long. 1° 35' 06". [ OS Grid Ref: NZ 26613 55735 (426613,555735) ] Account of Strata bored through in No. 4 Bore-hole for Messrs. Todd, Burleson & Co., commencing at the bottom of the Clay Pit, Birtley, about 50 feet below the level of the surface. Commenced April 18th, 1901 Approximate surface level 80 feet above sea (Ordnance datum)
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