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No. 2,577 — Colt CragTownship of Great Swinburn and Colwell, Northumberland Sheet 77 of 19thC Ordnance Map. Lat. 55° 06' 04", Long. 2° 05' 41". [ OS Grid Ref: NY 93957 78532 (393957,578532) ] Account of Strata passed through in Bore-hole F, Colt Crag Reservoir, June 1902 Approximate surface level 649.40 feet above sea (Ordnance datum)
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