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Bullard, F.M. (1976). Volcanoes of the Earth. Austin, University of Texas Press, Revised edition of Volcanoes: in History, in Theory, in Eruption., 579 pp, Hardback. University of Texas Press.
Simkin, Tom, and Fiske, Richard E. (1983). Krakatoa 1883; the Volcanic Eruption and its Effects. Washington: Smithsonian Institute Press, 1st. Smithsonian.
Maclaren, J.M. (1908). Gold: its Geological Occurrence and Geographical Distribution. London: The Mining Journal. 687 pp. Mining Journal.