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No. 2,579 — Colt CragTownship of Great Swinburn and Colwell, Northumberland Sheet 77 of 19thC Ordnance Map. Lat. 55° 06' 13", Long. 2° 05' 19". [ OS Grid Ref: NY 94347 78809 (394347,578809) ] Account of Strata passed through in Bore-hole 7, Colt Crag Reservoir, April 1902 Approximate surface level 665 feet above sea (Ordnance datum)
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