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Change in the Magnitude of River Flooding in the United States, 1965–2015, Environmental Protection Agency, https://www.epa.gov/climate-indicators/climate-change-indicators-river-flooding

Change in the Magnitude of River Flooding in the United States, 1965–2015, Environmental Protection Agency, https://www.epa.gov/climate-indicators/climate-change-indicators-river-flooding

U.S. Department of State

The Lessons of 1989: Freedom and Our Future