Transactions of the Royal Geological Society of Cornwall, Vol 2, p438 - 439
| An Account of the Annual Produce of the Copper Mines of Cornwall from the year 1771-1822 inclusive, II: 438-439, 1822. |
| An Account of the Annual Produce of the Copper Mines of Cornwall from the year 1771-1822 inclusive, II: 438-439, 1822. |