"armstead, h c. "
geothermal energy: / h.c. armstead - 1 ed. - france : unesco 1973. - ", 186p.; 27 cm." - earth sciences 12 .
includes bibliography
92-3-101063-8
--
621. 44 arm
geothermal energy: / h.c. armstead - 1 ed. - france : unesco 1973. - ", 186p.; 27 cm." - earth sciences 12 .
includes bibliography
92-3-101063-8
--
621. 44 arm