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No. 2,568 — Colt CragTownship of Great Swinburn and Colwell, Northumberland Sheet 77 of 19thC Ordnance Map. Lat. 55° 06' 17", Long. 2° 05' 26". [ OS Grid Ref: NY 94223 78933 (394223,578933) ] Account of Strata passed through in Trial Bore-hole A, Colt Crag Reservoir Approximate surface level 662.80 feet above sea (Ordnance datum)
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