@book{191110,
	author = {Duffield, Wendell A. and Sass, J. H. and Geological Survey (U.S.)  },
	title = {Geothermal energy},
	publisher = {U.S. Geological Survey},
	year = {2003.},
	series = {Circular},
	address = {Menlo Park, Calif.},
	note = {Shipping list no.: 2004-0008-P.},
	url = {http://geopubs.wr.usgs.gov/circular/c1249/}
}