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No. 326 — Burdon Main, otherwise Collingwood MainTownship of Chirton, Northumberland Sheet 89 of 19thC Ordnance Map. Lat. 54° 59' 57", Long. 1° 26' 51". [ OS Grid Ref: NZ 35340 67324 (435340,567324) ] Section of Strata sunk through at the Engine Pit, Collingwood Main Colliery Approximate surface level 62 feet above sea (Ordnance datum)
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