Report on the geology of Cornwall, Devon and West Somerset / by Henry T. De La Beche, F.R.S., &c., director of the Ordnance geological survey. Pub. by order of the Lords commissioners of Her Majesty's Treasury.

Licence: Public Domain Mark

Credit: Report on the geology of Cornwall, Devon and West Somerset / by Henry T. De La Beche, F.R.S., &c., director of the Ordnance geological survey. Pub. by order of the Lords commissioners of Her Majesty's Treasury. Source: Wellcome Collection.