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No. 2,570 — Colt CragTownship of Great Swinburn and Colwell, Northumberland Sheet 77 of 19thC Ordnance Map. Lat. 55° 06' 22", Long. 2° 05' 24". [ OS Grid Ref: NY 94259 79088 (394259,579088) ] Account of Strata passed through in Trial Bore-hole B2, Colt Crag Reservoir Approximate surface level 656.60 feet above sea (Ordnance datum)
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