Four-time Iditarod champion Martin Buser drives his dog team up the Yukon River after leaving the checkpoint in Anvik, Alaska, on Friday, March 8, 2013, during the Iditarod Trail Sled Dog Race. (AP Photo/Anchorage Daily News, Bill Roth)

Associated Press
Four-time Iditarod champion Martin Buser drives his dog team up the Yukon River after leaving the checkpoint in Anvik, Alaska, on Friday, March 8, 2013, during the Iditarod Trail Sled Dog Race. (AP Photo/Anchorage Daily News, Bill Roth)
Four-time Iditarod champion Martin Buser drives his dog team up the Yukon River after leaving the checkpoint in Anvik, Alaska, on Friday, March 8, 2013, during the Iditarod Trail Sled Dog Race. (AP Photo/Anchorage Daily News, Bill Roth)
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