W. Whellan, "Directory of the County of Durham", London,1856 (Durham County Record Office Library)
"Reports of the Inspector of Mines for the Year 1873", London, 1874 (Durham County Record Office, ref. D/DMA 255)
Ritson, Utrick
"Mines and Minerals and Mineral Statistics 1883", H.M. Inspector of Mines, London, 1884 (Mining Institute, Newcastle)
F. Whellan, "History, Topography and Directory of the County Palatine of Durham", London,1894 (Durham County Record Office Library)
"Potts' Mining Register and Directory for the Coal and Ironstone Trades of Great Britain & Ireland", North Shields 1895 (Tyne & Wear Archives Service Library)
Home Office, "List of Mines 1900", H.M. Inspector of Mines, London, 1901 (Mining Institute, Newcastle)
"Reid's Handy Colliery Guide and Directory for the Counties of Northumberland & Durham", Newcastle,1906 (Newcastle City Library)
"Reid's Handy Colliery Guide and Directory for the Counties of Northumberland, Durham, & Yorkshire", Newcastle,1911(Newcastle City Library)
"Reid's Handy Colliery Guide and Directory for the Counties of Northumberland, Durham, & Yorkshire", Newcastle,1919 (Newcastle City Library)
"Reid's Handy Colliery Guide and Directory for the Counties of Northumberland, Durham, & Yorkshire", Newcastle,1928 (Newcastle City Library)
"Reid's Handy Colliery Guide and Directory for the Counties of Northumberland, Durham, & Yorkshire", Newcastle,1936 (Newcastle City Library)
Bearpark Coal & Coke Co.
Ministry of Fuel & Power, "List of Mines in Great Britain & the Isle of Man, 1945", London, 1947 (Durham County Record Office Library)
Notes:
Annie, Fortune, Polo and Warren pits
"Reid's Handy Colliery Guide and Directory for the Counties of Northumberland, Durham, & Yorkshire", Newcastle,1928 (Newcastle City Library) Annie & Bettie, Fortune Pit
Ministry of Fuel & Power, "List of Mines in Great Britain & the Isle of Man, 1945", London, 1947 (Durham County Record Office Library)
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