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National Park Service biologists Allie Holdhusen, right, and Byron Karns prepare to dive for mussels in the Mississippi River near Pike Island August 14, 2015. They are working with a team to assess the health of all mussels in the river.

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02_Mussels.JPG
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Courtney Perry
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4280x2872 / 4.2MB
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National Park Service biologists Allie Holdhusen, right, and Byron Karns prepare to dive for mussels in the Mississippi River near Pike Island August 14, 2015. They are working with a team to assess the health of all mussels in the river.