Eppinger, Robert     Environmental geochemical studies of selected mineral deposits in Wrangell - St. Elias national park and Preserve, Alaska [Текст] / Robert Eppinger, Paul Briggs, danny Rosenkrans, Venessa Ballestrazze // U.S. Geological survey professional paper. N 1601-A-B / Geological survey - Washington : Government printing office , 2000. — IV,41 p.:il.