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USGS and University of Wisconsin at La Crosse scientists testing methylmercury contamination of fish in Voyaguer's National Park: Full resolution

USGS and University of Wisconsin at La Crosse scientists testing methylmercury contamination of fish in Voyaguer's National Park

Photo by Brent Knights, USGS, UMESC, May 2000

Usage: This image is public domain/of free use. Please refer to the USGS Copyright section for more details.

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