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No. 407 — CassopTownship of Cassop, Durham Sheet 27 of 19thC Ordnance Map. Lat. 54° 44' 19", Long. 1° 28' 16". [ OS Grid Ref: NZ 34048 38321 (434048,538321) ] Account of Strata sunk through at Cassop Colliery from Main Coal to Harvey Seam, and bored from Harvey to Brockwell, 1864 Approximate surface level 500 feet above sea (Ordnance datum)
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