Minnesota Public Radio slideshow:
Do taconite fibers cause cancer?
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Cook is a chemist with the EPA. His research showed taconite fibers could cause more tumors than asbestos fibers in rat lungs. (MPR Photo/Stephanie Hemphill)

Cook is a chemist with the EPA. His research showed taconite fibers could cause more tumors than asbestos fibers in rat lungs.

(MPR Photo/Stephanie Hemphill)
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