"Irazu Volcano." Encyclopedia Britannica. 23 Mar. 2009
"Volcanoes of Costa Rica." Arenal.net. 25 Mar. 2009
"Volcan Irazu." Flickr. 25 Mar. 2009 http://www.flickr.com/photos/hand_of_sands/3138555236/.
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The Green colored water in Irazu's craters
© Luis César
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