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No. 240 — BlaydonTownship of Winlaton, Durham Sheet 6 of 19thC Ordnance Map. Lat. 54° 57' 06", Long. 1° 43' 45". [ OS Grid Ref: NZ 17344 61933 (417344,561933) ] Strata sunk through in the Mary Pit, near Blaydon Approximate surface level 430 feet above sea (Ordnance datum)
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