Apogee Interactive Inc.
http://cenhud.apogee.net/geo/
US Department of Energy
http://www.eere.energy.gov/geothermal/
International Ground Source Heat Pump Association
http://www.igshpa.okstate.edu/
Geoexchange Heat Pump Consortium
http://www.geoexchange.org/resources/47-resources/48-what-is-geoexchange.html
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