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Geological observations on the volcanic islands, visited during the voyage of H.M.S. Beagle, together with some brief notices on the geology of Australia and the Cape of Good Hope. Being the second part of the Geology of the voyage of the Beagle under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836 / [Charles Darwin]. Public Domain Mark. Source: Wellcome Collection.