Pliny the Elder (23-79 A.D.). The natural history. Book XXVI, Chapter LXXX. Cited after: Bostock J, Riley HT,
editors. London: Taylor and Francis; 1855. The perseus digital library. Available at:
http://www.perseus.tufts.edu/hopper/text?doc=Perseus%253atext%253a1999.02.0137 Accessed April 5, 2013
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