Todd Nelson, civilian contractor, maneuvers a tractor into place as he prepares to clear more snow at a dormitory parking lot Feb. 11, 2013, on Grand Forks Air Force Base, N.D. Delayed reporting to the base was implemented as a safety precaution after Winter Storm Orko brought blizzard conditions to the region on Sunday. Nelson began shoveling snow around the base at 3 a.m. and estimated he moved more than 12 tons by 11 a.m. (U.S. Air Force photo/Senior Airman Luis Loza Gutierrez)
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