pdf Hall, M. L., Mothes, P. A., Samaniego, P., Militzer, A., Beate, B., Ramón, P., & Robin, C. (2017) Popular

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Antisana volcano: A representative andesitic volcano of the eastern cordillera of Ecuador: Petrography, chemistry, tephra and glacial stratigraphy. Journal of South American Earth Sciences, 73, 50-64.

https://doi.org/10.1016/j.jsames.2016.11.005