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No. 1,069 — HartleyTownship of Hartley, Northumberland Sheet 81 of 19thC Ordnance Map. Lat. 55° 04' 51", Long. 1° 28' 29". [ OS Grid Ref: NZ 33530 76398 (433530,576398) ] Account of the different Strata met with in sinking the Mill Pit, Hartley Colliery. Begun October 16th, 1830 Approximate surface level feet above sea (Ordnance datum)
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