Geothermal energy : its past, present and future contributions to the energy needs of man / H. Christopher H. Armstead. — 2nd ed. — New York : E. & F.N. Spon, 1983. — CIDIMA. — 404 p. : il., gráf., tab. ; 24 cm. — ISBN 0-419-12220-6 1. Energía geotérmica.2. Recursos naturales.