Forster, Michael, (1831). ‘the Effects of a Basaltic Dyke of Butterknowle Colliery, two Miles NW of Cockfield [Northumberland]’, extract from Trans Nat Hist Soc of Northumberland, Durham and Newcastle. v1,. Trans Northum, Durham, Newcastle.
Forster, Michael, (1831). ‘Notice on the Effects of a Basaltic Dyke of Butterknowle Colliery, two Miles NW of Cockfield [Northumberland]’, extract from Transactions of the Natural History Society of Northumberland,...