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2. The Ngawha Geothermal Area;Browne;N.Z. Dep. Scient. Ind. Res.,1981
3. Ground radon survey of a geothermal area in Hawaii;Cox;Geophys. Res. Lett.,1980
4. Fault location by radon and mercury detection at an active volcano in Nicaragua;Crenshaw;Nature,1982
5. Anomalies in concentration of radon in the earth;Fleischer,1978