http://adsabs.harvard.edu/abs/1993GeoRL..20.2571R
http://pubs.usgs.gov/fs/1997/fs113-97/
http://www.absoluteastronomy.com/topics/Mount_Pinatubo
Sunday, March 29, 2009
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Pinatubo's eruption in 1991 was the 2nd largest in the century!
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