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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. Chris looks for fish with the electric power back on his back while Don looks for a good crossing place on the Colorado River. (JUDY WALGREN/ROCKY MOUNTAIN NEWS)

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