00295nam a2200097   450000100070000000500170000700800360002410000580006024500380011826400410015601287320260807101711.0260101s1994    pe      000 0 eng  d1 aWendell A. Duffield ; John H. Sass ; Michael L. Sorey10aTapping the Earth´s Natural Heat 1aDenverbU.S. Geological Surveyc1994