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- [1] Hydrothermal fluid origins in Mississippi valley-type ore districts: Combined noble gas (He, Ar, Kr) and halogen (Cl, Br, I) analysis of fluid inclusions from the Illinois-Kentucky fluorspar district, Viburnum Trend, and Tri-State districts, midcontinent United States [J]. ECONOMIC GEOLOGY AND THE BULLETIN OF THE SOCIETY OF ECONOMIC GEOLOGISTS, 2002, 97 (03): : 453 - 469