Transactions of the Royal Geological Society of Cornwall, Vol 2, p232 - 241
| On the Intersections of Lodes in the direction of their Dip or Underlie, J Hawkins, [Read October, 1820], II: 232-241, 1822. |
| On the Intersections of Lodes in the direction of their Dip or Underlie, J Hawkins, [Read October, 1820], II: 232-241, 1822. |