1. Geothermal energy resources of the western United States Yale Public content 1977. 2018-06-21T17:44:44Z. 2018-06-21T18:19:40Z. National Geophysical and Solar-Terrestrial Data Center. National Geophysical and Solar-Terrestrial Data Center. English. cartographic image. Public. West (U.S.), U.S., and United States, West.