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Aiuppa., A.; Rotolo, S. G.; Villa, I. M. (1999). Stratigraphy, geochemistry and geochronology of a Quaternary pyroclastic sequence of the Chichontepec volcano, El Salvador. Revista Geológica de América Central, 22, pp. 75-86. Universidad de Costa Rica 10.15517/rgac.v0i22.8588
