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No. 352 — ButterknowleTownship of Lynesack and Softley, Durham Sheet 41 of 19thC Ordnance Map. Lat. 54° 37' 29", Long. 1° 49' 44". [ OS Grid Ref: NZ 11047 25535 (411047,525535) ] Boring to th West of Oliver's Mill, up Grewburn, to Yard Coal Seam, by Stout and Hindmer. 1825 Approximate surface level 600 feet above sea (Ordnance datum)
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