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/cdn.vox-cdn.com/uploads/chorus_asset/file/19489335/geothermal_pump_x.jpg "Geothermal Heat Pump: How It Works - This Old House")
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Geothermal Energy | A Student's Guide to Global Climate Change | US EPA
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Purdue University - Hydrologic Impacts Group
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5 Things You Should Know about Geothermal Heat Pumps | Department of Energy
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