United States. Cong. Mount Pinatubo, Philippines Photo Archives. By Lyn Topinka. Ed. Lyn Topinka.
USGS. 20 Aug. 2008. 23 Mar. 2009
Riikonen, Marko. Mt. Pinatubo. Mt. Pinatubo. "Mt. Pinatubo Volcano, Phillipines." Malapascua Island . 23 Mar. 2009 http://www.malapascua.de/Volcanoe-Map/Pinatubo__Philippines/%20.
Encyclopedia of Earthquakes and Volcanoes
By David Ritchie & Alexander E. Gates PH.D.
Pages 177-178
For more information on Mt. Pinatubo you can visit
http://www.teachersdomain.org/resource/ess05.sci.ess.earthsys.lahar/
or watch a video of The 1991 Eruption at
http://videos.howstuffworks.com/discovery/7169-1991-mount-pinatubo-erruption-video.htm
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