Transactions of the Royal Geological Society of Cornwall, Vol 2, p285 - 289
| Observations of the Alluvial Strata of Porth, Sandrycock, & Pentuan, J Hawkins, II: 285-289, 1822. |
| Observations of the Alluvial Strata of Porth, Sandrycock, & Pentuan, J Hawkins, II: 285-289, 1822. |