![Lyell, Charles. 1833. Principles of geology, being an attempt to explain the former changes of the earth's surface, by reference to causes now in operation. London: John Murray. Volume 3. Lyell, Charles. 1833. Principles of geology, being an attempt to explain the former changes of the earth's surface, by reference to causes now in operation. London: John Murray. Volume 3.](http://darwin-online.org.uk/converted/Ancillary/BeagleLibrary/1830-3_Lyell_A505/1833_Lyell_A505.3_figfrontis.jpg)
Lyell, Charles. 1833. Principles of geology, being an attempt to explain the former changes of the earth's surface, by reference to causes now in operation. London: John Murray. Volume 3.
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