Darwin, Charles: Geological oberservations on the volcanic islands, visited during the voyage of H. M. S. Beagle, together with some brief notices on the geology of Australia [...] : 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. London : Smith, Elder and Co. 1844