frac sand mining
Frac sand mining in the St. Croix Valley is the topic for the Sunday, May 6, 2012 Earth Day Conference sponsored by the St. Croix Conservation Study Center and its partner organizations from 1-4 p.m. at the St. Croix Falls Public Library, 230 S. Washington St., St. Croix Falls, Wis. A panel of exper...Read More
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