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Geothermal energy : clean power from the Earth's heat:

Duffield, Wendell A ; Sass, J. H. (John Harvey), 1937- ; Geological Survey (U.S.)
Also available via Internet from the USGS web site. Address as of 10/27/03: http://geopubs.wr.usgs.gov/circular/c1249/C1249.pdf; current access is available via PURL..  , 2003
Link: http://hdl.handle.net/2027/umn.31951d02181793q