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_cropped_2.JPG%2f220px-David_Johnston_near_crest_of_the_bulge_on_the_north_side_of_Mount_St._Helens%252C_17_May_1980_(USGS)_cropped_2.JPG&cdnurl=https%3a%2f%2fth.bing.com%2fth%2fid%2fR.bcd3d8f2bdc39209ea457c269f9d356f%3frik%3dklxLPeVmDoI7fg%26pid%3dImgRaw%26r%3d0&exph=183&expw=220&q=David+Johnston+Volcanologist&simid=608020039929697463&FORM=IRPRST&ck=1FF0C1F4B501C54945B97CC4561131C7&selectedIndex=9&itb=0)
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