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No. 353 — ButterknowleTownship of Lynesack and Softley, Durham Sheet 41 of 19thC Ordnance Map. Lat. 54° 37' 23", Long. 1° 49' 48". [ OS Grid Ref: NZ 10975 25349 (410975,525349) ] Boring upwards, by Sedger and Brown, to the Top of Main Coal Seam from Drift 20 yards South of Whin Dyke, at Copley Bent. January 29th, 1829 Approximate surface level 630 feet above sea (Ordnance datum)
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