. "1 Physical Setting and Geologic History." The Eruption of Nevado Del Ruiz Volcano Colombia, South America, November 13, 1985. Washington, DC: The National Academies Press, 1991.
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FIGURE 1.1 The summit region of Nevado del Ruiz volcano subsequent to the November 13, 1985 eruption. Note vapor cloud issuing from the summit crater and the tephra blanket overlying the glacial ice cap. (Photograph by D. Herd, USGS.)
