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No. 999 — HaltonTownship of Aydon Castle, Northumberland Sheet 86 of 19thC Ordnance Map. Lat. 55° 00' 09", Long. 1° 58' 45". [ OS Grid Ref: NZ 01332 67555 (401332,567555) ] Account of the Boring near Halton, in Aydon East Field, about 450 yards to the N.W. from White House. September 1st, 1757 Approximate surface level 495 feet above sea (Ordnance datum)
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