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No. 391 — CallertonTownship of Black Callerton, Northumberland Sheet 87 of 19thC Ordnance Map. Lat. 55° 00' 55", Long. 1° 44' 25". [ OS Grid Ref: NZ 16606 69008 (416606,569008) ] Account of a Boring at Callerton, about 250 yards North from Lough House, and about 60 yards East from an Old Pit, November 30th, 1776 Approximate surface level 300 feet above sea (Ordnance datum)
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