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Weaver, E. (2005). Global Warming: the Complete Edition. [3]Geoscience Canada.
Global Warming
Sogade J., Vichabian Y., Vandiver A., Reppert P., Coles D., Morgan F. Electromagnetic Cave-to-Surface Mapping System. IEEE Transactions on Geoscience and Remote Sensing, vol. 42, no. 4, 2004, p754.
Remote Sensing
Simkin, Tom and Siebert, Lee, "Volcanoes of the World," Geoscience Press, Tuscon, AZ, 349 pp., 1994 from: htp://volcano.und.nodak.edu/vwdocs/volc_images/south_america/ecuador/tungurahua.html
Tungurahua Volcano, Ecuador
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