Transactions of the Royal Geological Society of Cornwall, Vol9, p34 - 37
| Notice of an Accumulation of Carburetted Hydrogen or “Fire Damp”, in the Ding Dong Mine situated in the Parish of Madron near Penzance, S Higgs, IX, 34,37, 1875. |
| Notice of an Accumulation of Carburetted Hydrogen or “Fire Damp”, in the Ding Dong Mine situated in the Parish of Madron near Penzance, S Higgs, IX, 34,37, 1875. |