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(8/24/2004, Denver, CO) Researchers have found evidence that nitrogen compounds from Front Range tailpipes, power plants, crop fields and feed lots has altered the subalpine forest and alpine tundra in the Rocky Mountain National Park's Loch Vale watershed. Each Tuesday, park technician Lisa Foster samples stream water, collects precipitation that falls on the Loch Vale experimental site, and downloads data for scientist Jill Baron, who works for the U.S. Geological Society. Lisa is collecting precipitation collected at the top of this tower in a bucket that she will backpack down the mountain. (PHOTO BY JUDY WALGREN/ROCKY MOUNTAIN NEWS)

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