Jelaskan Meja ringkasan dari Letusan Gunung St. Helens 1980 dalam bahasa melayu

Topinka, Lyn. Mount St. Helens: A General Slide Set, Cascades Volcano Observatory, U.S. Geological Survey. Retrieved on 2007-05-10

List of victims with biographical details

USGS: Mount St. Helens 1980 Debris Avalanche Deposit

USDA Forest Service: Mount St. Helens VolcanoCam

Pre-1980 Eruptive History of Mount St. Helens, Washington

USGS: Before, During, and After May 18, 1980

Boston.com – The Big Picture – 30 years later

Aerial pictures of the July 22nd, 1980 secondary eruption

News reports  at The Museum of Classic Chicago Television

Bencana alam di Amerika Syarikat