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St. Paul, Minn.

How does fracking affect Minnesota?

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Fracking sand
The Unimin sand is prized by the fracking industry because the individual grains are very hard and round.
MPR Photo/Mark Steil
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Fracking sand
The Unimin sand is prized by the fracking industry because the individual grains are very hard and round.
MPR Photo/Mark Steil
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