Siluria : The history of the oldest known rocks containing organic remains, with a brief sketch of the distribution of gold over the earth / By Sir Roderick Impey Murchison...
"This work is a condensation of the author's 'Silurian system'... and of the 'Geology of Russia', &c., by Murchison, Verneuil & Count Keyserling"--British museum (nat. hist.) Catalogue.