Newhall, Christopher G. (1996); IAVCEI/International Council of Scientific Unions' Decade Volcano Projects: Reducing Volcanic Disaster, Status Report, United States Geological Survey, Washington, D.C.[1]互联网档案馆的存檔,存档日期November 15, 2004,.
Newhall, Christopher G. (1996); IAVCEI/International Council of Scientific Unions' Decade Volcano Projects: Reducing Volcanic Disaster, Status Report, United States Geological Survey, Washington, D.C.[1]互联网档案馆的存檔,存档日期November 15, 2004,.