Transactions of the Royal Geological Society of Cornwall, Vol.3 p203 - 207
| On a Singular exudation of Gas in the Union Mines, W J Henwood, [Read October, 1826], III: 203-207, 1828. |
| On a Singular exudation of Gas in the Union Mines, W J Henwood, [Read October, 1826], III: 203-207, 1828. |