York, NY: Checkmark Books, 2001. pg. 51. (HARD COPY)
Baker, Christopher. Costa Rica, The Land. 27 Mar. 2009
"Irazu Volcano." Costa Rica Tourism. 27 Mar. 2009
Cat.inist. 27 Mar. 2009
Friday, March 27, 2009
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The Green colored water in Irazu's craters
© Luis César
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