Environmental groups warned 12 years ago that the nation's tallest dam in California was an imminent disaster.
원문출처 : http://www.cnn.com/2017/02/13/us/oroville-dam-warnings-ignored/index.html
원문출처 : http://www.cnn.com/2017/02/13/us/oroville-dam-warnings-ignored/index.html