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No. 323 — Burdon Main, otherwise Collingwood MainTownship of Chirton, Northumberland Sheet 89 of 19thC Ordnance Map. Lat. 55° 00' 20", Long. 1° 27' 45". [ OS Grid Ref: NZ 34375 68028 (434375,568028) ] Section of Strata from Thill of High Main Coal Seam to Thill of Low Main Coal Seam, in the Chance Pit, Collingwood Main Colliery Approximate surface level 130 feet above sea (Ordnance datum)
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