Release June 1, 2001. Crater Lake Can't Hide Its Bottom . Getting to the Bottom of Things at Crater Lake . By U. S. Geological Survey, News Release. Release July 21, 2000.
Scientists begin mapping of Crater Lake floor .
By U. S. Geological Survey Volcano Hazards Program. Release July 2000. Scientists finish mapping floor of Crater Lake . By U. S. Geological Survey Volcano Hazards Program. Release August 2000.