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No. 2,578 — Colt CragTownship of Great Swinburn and Colwell, Northumberland Sheet 77 of 19thC Ordnance Map. Lat. 55° 06' 03", Long. 2° 05' 43". [ OS Grid Ref: NY 93921 78501 (393921,578501) ] Account of Strata passed through in Bore-hole G, Colt Crag Reservoir Approximate surface level 649½ feet above sea (Ordnance datum)
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