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National Park Service biologist Allie Holdhusen exits the water with a bag of mussels she collected for observation in the Mississippi River near Pike Island August 14, 2015. The mussels are counted, identified, and measured before they are returned to the river.

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07_Mussels.JPG
Copyright
Courtney Perry
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4188x2840 / 2.7MB
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National Park Service biologist Allie Holdhusen exits the water with a bag of mussels she collected for observation in the Mississippi River near Pike Island August 14, 2015.  The mussels are counted, identified, and measured before they are returned to the river.