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No. 1,030 — Harbour HouseTownship of Framwellgate, Durham Sheet 20 of 19thC Ordnance Map. Lat. 54° 49' 33", Long. 1° 33' 24". [ OS Grid Ref: NZ 28479 47988 (428479,547988) ] Strata sunk through in the Northernmost Shaft at Harbour House, the surface being about 12 fathoms above River Approximate surface level 105 feet above sea (Ordnance datum)
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