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Figure 4.2.4. Map of the United States (excluding Alaska) showing cumulative groundwater depletion, 1900 through 2008, in 40 assessed aquifer systems or subareas. Colors are hatched in the Dakota aquifer where the aquifer overlaps with other aquifers having different values of depletion.
Originally uploaded in Integrate:Teaching for Sustainability:InTeGrate Modules:Future of Food:Student Materials.

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Last Modified: 2018-01-03 11:27:48
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Credit: <a href="https://water.usgs.gov/edu/gwdepletion.html">USGS: Groundwater depletion</a>
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