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No. 1,553 — PontopTownship of Collierly, Durham Sheet 11 of 19thC Ordnance Map. Lat. 54° 52' 27", Long. 1° 46' 54". [ OS Grid Ref: NZ 14009 53298 (414009,553298) ] A Boring in Pontop Colliery, about 250 yards W.S.W. from the Spring Pit. April 16th, 1752 Approximate surface level 650 feet above sea (Ordnance datum)
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