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Hydro - Data Erdwärme, Geothermie www.hydro-data.com
USA
NREL National Renewable Energy Laboratory http://www.nrel.gov
igshpa International Ground Source Heat Pump Association www.igshpa.okstate.edu
INL Idaho National Laboratory geothermal.id.doe.gov
U.S. Department of Energy Geothermal Research at Sandia National Laboratories cfwebprod.sandia.gov
Schweitz
Geothermal Explorers LTD Geothermal Explorers LTD www.geothermal.ch
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H2now site 2006