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North American Drought: A Paleo Perspective
Information "to explain how paleoclimatic data can provide information about past droughts and about the natural variability of drought over timescales of decades to millennia." Includes maps that display droughts of the 20th century (including the Dust Bowl); data for the past 500 and 2,000 years; and even earlier information derived from pollen, charcoal, and lake level changes. From the National Oceanic and Atmospheric Administration (NOAA).
http://www.ncdc.noaa.gov/paleo/drought/
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