Maciel, F. R., 1981. Geological mapping in geothermal exploration with special reference to tephrochronology and paleomagnetic techniques. Report 4, 78 pp. 
Layugan, D.B., 1981. Geoelectric sounding and its application in the Theistareykir high-temperature area, NE-Iceland. Report 5, 101 pp. 
Martinez, M.J., 1981. Interpretation of water compositions from the Masaya-Carazo-Granada area, SE-Nicaragua. Report 6, 46 pp. 
Regalado, J.R., 1981. A study of the response to exploitation of the Svartsengi geothermal field, SW-Iceland. Report 7, 111 pp.
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Shen Xing-wu 1981. Use of computer programs for calculations in low-temperature geothermal utilization. Report 8, 78 pp. 
Sun Kaiyao 1981. Geothermal district heating in Tianjin, China: Present status and suggested development using the resources outside the city. Report 9, 84 pp.
Tang Song-ran 1981. High temperature geothermal drilling and completion in Iceland. Report 10, 44 pp.
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