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VOLCANOLOGISTS FORM NEW GROUP FOR MONITORINGSIGVALDSON GE.1981; GEOTIMES; ISSN 0016-8556; USA; DA. 1981-12; VOL. 26; NO 12; PP. 22-23Article
GEOCHEMISTRY OF THE AHUACHAPAN THERMAL AREA, EL SALVADOR, CENTRAL AMERICA.SIGVALDSON GE; CUELLAR G.1970; U.N.SYMPOSIUM.DEVELOPM.UTILIZ.GEOTHERMAL.RESOURCES-PISA-PREPR.-SECT.5.; 1970, NUM. 0013-005 , P. 1 A 14Miscellaneous