Minnesota Public Radio slideshow:
Minnesota's waters becoming more polluted
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Volunteer Tim Olson dropped this plastic tube into the Red River to collect a water sample. He then checks the sample for levels of various pollutants. (MPR Photo/Dan Gunderson)

Volunteer Tim Olson dropped this plastic tube into the Red River to collect a water sample. He then checks the sample for levels of various pollutants.

(MPR Photo/Dan Gunderson)
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