| Fridleifsson, I.B., 1998: Twenty years of geothermal training in Iceland. |
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| Reyes, A.G, 1998.: Development of petrological techniques in the exploration and exploitation of Philippine geothermal systems. |
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| Monterrosa Vásquez, M.R., 1998: Present status of geothermal development in El Salvador and contribution of UNU Fellows in the geothermal scenario and management. |
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| Ng'ang'a, J.N., 1998: Status of geothermal development in Kenya, June 1998. |
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| Pang Zhonghe, 1998: Isotope and geochemical techniques in geothermal investigations in China: an overview. |
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| Gunnlaugsson, E., 1998: Hitaveita Reykjavíkur. Past - present - future. |
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| Kepinska, B., 1998, 1998: Geothermal energy in Poland: The state-of-the-art in 1998 and future prospects. |
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| Zhang Baiming, 1998: Geothermal energy development in Tianjin, China. |
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| Wang Li, 1998: UNESCO International Research and Training Centre for Rural Education (INRULED) and geothermal development in rural areas. |
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| Axelsson, G., Sverrisdóttir, G., Flóvenz, Ó.G., Árnason, F., Árnason, Á., and Bödvarsson, R., 1998: Thermal energy extraction, by reinjection, from a low-temperature geothermal system in N-Iceland. |
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| Bojadgieva, K., 1998: Geothermal energy development in Bulgaria. |
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| Benito, F., 1998: The role of government in Philippine geothermal energy development. |
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| Stefánsson, V., 1998: Estimate of the world geothermal potential. |
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| Muchemi, G.G., 1998: Geothermal exploration in the Kenya Rift. |
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| Sarmiento, Z.F., 1998: Long-term responses of geothermal reservoirs in the Philippines. |
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| Jordan, O.T., Garcia, S.E., Macambac, R.V., Gonzalez, R.C., Malate, R.C.M., and Ruaya, J.R., 1998: Prevention of silica scale formation in geothermal environments using chemical methods. |
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| Rosca, R., 1998: Geothermal development in Romania. |
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| Grajeda, C., 1998: Guatemalan geothermal energy. |
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| Ganda, S., 1998: The role of geothermal industry in private power development in Indonesia. |
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| Arnórsson, S., 1998: Geothermal geochemistry, historical overview, present status, future outlook. |
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