Upper Midwest Environmental Sciences Center

UMESC - Celebrating 50 Years of Science for a Better World - 1959-2009

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USGS scientist measuring the endangered Higgins' eye pearlymussel on the Upper Mississippi River: Full resolution

USGS scientist measuring the endangered Higgins' eye pearlymussel on the Upper Mississippi River

Photo by Pete Boma, USGS, UMESC, 2007

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