Transactions of the Royal Geological Society of Cornwall, Vol 2, p426 - 427
| An Account of the Annual Produce of the Tin Mines of Cornwall from the year 1750-1821 inclusive, II: 426, 1822. |
| An Account of the Annual Produce of the Tin Mines of Cornwall from the year 1750-1821 inclusive, II: 426, 1822. |