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No. 11 — Allenshead or Allen's Close CollieryTownship of Otterburn, Northumberland Sheet 51 of 19thC Ordnance Map. Lat. 55° 14' 10", Long. 2° 10' 02". [ OS Grid Ref: NY 89367 93563 (389367,593563) ] Borehole in Girsonsfield side, about 15 fathoms below level of Quarry Hole Approximate surface level 570 feet above sea (Ordnance datum)
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