In this Jan. 15, 2014 photo, Norberto Munive cuts down a large pine tree near Sheridan Lake, S.D. The survey conducted by the U.S. Forest Service, South Dakota's Agriculture Department and Wyoming's State Forestry Division measured trees that were infected by pine beetles that left trees in the fall of 2012 and spread to new timber last year. (AP Photo/Rapid City Journal, Chris Huber)
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