TY  - BOOK
AU  - Duffield,Wendell A.
AU  - Sass,J.H.
AU  - Sorey,M.L.
TI  - Tapping the earth's natural heat
T2  - U.S. Geological Survey circular
AV  - GB1199.5 .D84 1994
U1  - 333.8/8 20
PY  - 1994///
CY  - Washington
PB  - U.S. G.P.O.
KW  - Geothermal resources
KW  - Local
N1  - Includes bibliographical references (p. 56-57)
ER  -