US Geological Survey
Us Geological Survey/ 20th Century Eruptions
table of 20th century eruptions. The dates are in chronological order starting with the most recent. Each eruption has a link and a description.
Other
Awesome80s.com: Mt. St. Helen's Eruption
Read about the eruption of Mt. St. Helen's. Includes first-hand descriptions by geologists. Also includes a table which lists other notable volcanic eruptions that have happened in the 20th century.