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No. 347 — Bush BladesTownship of Collierly, Durham Sheet 12 of 19thC Ordnance Map. Lat. 54° 52' 28", Long. 1° 44' 21". [ OS Grid Ref: NZ 16736 53338 (416736,553338) ] A Boring from the Hard Coal Seam to Hutton seam, about 140 yards North West from the Broom Pit, Bush Blades Colliery. September, 1771 Approximate surface level 745 feet above sea (Ordnance datum)
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