Increasing the use of geothermal energy : hearing before the Subcommittee on Mines and Mining of the Committee on Interior and Insular Affairs, House of Representatives, Ninety-sixth Congress, first session, on H.R. 4471, to accelerate the priority development of geothermal energy in the United States, to amend the Geothermal stream act of 1970, the Geothermal energy research, development, and development act of 1974, and the National energy act of 1978, and for other purposes, H.R. 5187, to establish a forgivable loan program for geothermal reservoir confirmation, to amend existing geothermal leasing and permitting laws, and for other purposes, hearing held in Washington, D.C., September 6, 1979.