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No. 1,155 — HettonTownship of Hetton-le-Hole, Durham Sheet 21 of 19thC Ordnance Map. Lat. 54° 49' 01", Long. 1° 26' 27". [ OS Grid Ref: NZ 35928 47052 (435928,547052) ] An Admeasurement of the Minor Pit to the Main Coal Coal, and Strata sunk through from there to the Hutton Seam. Begun December 23rd, 1820 ; finished January 6th, 1823 Approximate surface level 330 feet above sea (Ordnance datum)
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