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Thursday, Jul 25, 2013 - 8:30 PM    Filmmaker John Grabowska presents a lyrical interpretation of the geologic story of Yellowstone. Formation of glaciers, mountain ranges and the gigantic caldera of a supervolcano provide a sweeping saga. A short concluding film "Yellowstone's Cascade Corner" features the portion of the national park that lies in Idaho and is filmed and produced by Idaho Public Television. G
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