Forster, Francis, (1831). ‘Geology of Ratcheugh Crag, near Alnwick ’, extract from Trans. Nat. Hist. Soc. Northumberland, Durham & Newcastle 1831. v1,. Trans Northum, Durham, Newcastle.
Forster, Francis, (1831). ‘Observations on the Geology of Ratcheugh Crag, near Alnwick [Northumberland]’, extract from Transactions of the Natural History Society of Northumberland, Durham and Newcastle upon Tyne, 1831. v1,...