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| An Account of the Strata of Northumberland and Durham | Volume: A-B, Page: 166 |
No. 219 — Blackfield
Township of ,
Sheet of 19thC Ordnance Map. Lat. , Long. .
Strata sunk through at Blackfield Colliery
Approximate surface level feet above sea (Ordnance datum)
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| Source: | An Account of the strata of Northumberland & Durham as proved by Borings & Sinkings, Volume A-B, published by the North of England Institute of Mining & Mechanical Engineers, 1878 |
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