Transactions of the Royal Geological Society of Cornwall, Vol 2, p440 - 444
| Quantity of Copper produced in Great Britain & Ireland, in the years ending 30th June 1818-1822, II: 440-444, 1822. |
| Quantity of Copper produced in Great Britain & Ireland, in the years ending 30th June 1818-1822, II: 440-444, 1822. |