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Please view the following links, as they may be of great interest to you.
International Ground Source Heat Pump Association - http://www.igshpa.okstate.edu/
Geothermal Heat Pump Consotium (GHPC) - http://www.geoexchange.org/
GEOPRO, INC. - http://www.geoproinc.com/
Geothermal Resource Technologies INC. (GRTI) - http://www.grti.com/
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