download some relevant papers about the volcanoes:
CCVG 10 El Chichon field guide.pdf
Casadevall_Chichon_JVGR_84.pdf
Taran Colima fumarole chemistry silica tubes.pdf
Taran geochemical precursors Colima.pdf
Taran_ElChichon_BullVol_98.pdf
Nencetti Chiapas Springs GI 2005.pdf
Rouwet El Chichon JVGR 2008.pdf
Rouwet El Chichon lake GI 2004.pdf
Taran Chichon springs JVGR 2008.pdf
Taran Rouwet Chichon JVGR 2008.pdf