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| Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 232, 234-235. |
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| Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 90, 231-234. |
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| Green, David I., McCallum, David, Wood, Mike (2000) Famous Mineral Localities: The Brownley Hill Mine, Alston Moor District, Cumbria, England. The Mineralogical Record, 31 (3) 231-250
Cotterell, T.F. (2022). Pondering the discovery of aerated ponderous spar: The type locality and early history of witherite. Journal of the Russell Society, 25, 10-56. |
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| Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 136-138, 143-144 |
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| Day, Harry (1999) BMS Database, British Micromount Society. |
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| [Specimen in the Natural History Museum, London] |
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| Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 106, 112. |
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| Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 154 |
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| Dunham, Sir K. C. Geology of the North Pennine Orefield, Volume 1 Tyne to Stainmore (2nd Edition), pp 156-158 |
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| Dunham: The Geology of the Northern Pennine Orefield, Vol I Tyne to Stainmore pp 140. |
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Nentsberry Haggs Mine, Alston Moor, Eden, Cumbria, England, UK