Transactions of the Royal Geological Society of Cornwall, Vol.4 p475 - 480
| Some account of the Soft Growan at Beam Mine in the Parish of Roche and at Carclaze Mine, in the Parish of St Austle [sic], J Hawkins, [Read October, 1830], IV: 475-480. |
| Some account of the Soft Growan at Beam Mine in the Parish of Roche and at Carclaze Mine, in the Parish of St Austle [sic], J Hawkins, [Read October, 1830], IV: 475-480. |