Duffield, W.A., and Sass, J.H., 2004, Geothermal Energy - Clean Power From the Earth's Heat: U.S. Geological Survey Circular 1249, 43 p.
http://pubs.usgs.gov/circ/2004/c1249/
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http://pubs.er.usgs.gov/pubs/cir/cir1060
Barker, C.E., 1990, Evidence for a geologically rapid increase and stabilization of vitrinite reflectance in response to a short-term temperature increase, Cerro Prieto geothermal system, Mexico [abs.], in Carter, L. M. H., ed., U.S. Geological Survey research on energy resources--1990, Program and abstracts, Sixth V.E. McKelvey Forum on Mineral and Energy Resources, Houston, TX, Feb. 20-22, 1990: U.S. Geological Survey Circular 1060, p. 4-5.
http://pubs.er.usgs.gov/pubs/cir/cir1060
Robbins, E.I., 1977, Geothermal gradients, in Scholle, P. A., ed., Geological studies in the B-2 COST well, U.S. Mid-Atlantic Outer Continental Shelf area: U.S. Geological Survey Circular 750, p. 44-45.
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5 online reference(s) found in Energy Publications Database.