Paleoclimate information derived from tree ring based data on river flow in all of the major U.S. river basins going back in some cases as much as 1,000 years, is available here. The site is called "Tree Flow".
This is particularly valuable for anthropologists of the ill documented Native American archaeological cultures of what is now the United States because paleoclimate data can often provide motivation and explanation for why archaeological cultures rose, fell or changed.
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