Bibliography
Information found at:
Wikipedia - Mount Unzen http://en.wikipedia.org/wiki/Mount_Unzen
Britannica - Mount Unzen http://www.britannica.com/EBchecked/topic/618550/Mount-Unzen
Usgs - Mount Unzen http://vulcan.wr.usgs.gov/Volcanoes/Japan/description_unzen.html
AbsoluteAstronomy - Mount Unzen http://www.absoluteastronomy.com/topics/Mount_Unzen
Wikipedia - Mount Unzen http://en.wikipedia.org/wiki/Mount_Unzen
Britannica - Mount Unzen http://www.britannica.com/EBchecked/topic/618550/Mount-Unzen
Usgs - Mount Unzen http://vulcan.wr.usgs.gov/Volcanoes/Japan/description_unzen.html
AbsoluteAstronomy - Mount Unzen http://www.absoluteastronomy.com/topics/Mount_Unzen