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(10/07/04, Rocky Mountain National Park, CO) Don Campbell, with the United States Geological Survey out of Lakewood, with the help of Chris Kennedy, Molly Bensely, and Linda Beck, from the United States Fish and Wildlife Service, are studying mercury levels in fish caught near the Sun Valley Ranch Bridge, which is across the street from the RMNP Visitor Center for the entrance near Grand Lake. Brown trout wait to be cut up for samples. (JUDY WALGREN/ROCKY MOUNTAIN NEWS)

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