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1.- Origin of the low Delta (super 18) O silicic ignimbrites associated with the Guachipelin Caldera, NW Costa Rica Geological Society of America (GSA); Boulder, CO; USA; United States, 2009 Geological Society of America, North-Central Section, 42nd annual meeting Ver registro
2.- Trace-element variations induced by incipient weathering of volcanic rocks; implications for interpretations of Central American volcanism Geological Society of America (GSA); Boulder, CO; USA; United States, 2009 Geological Society of America, North-Central Section, 42nd annual meeting Ver registro
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