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Iditarod dog sled

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Four-time champion musher Martin Buser holds the lead in the Iditarod Trail Sled Dog Race.
Iditarod dog sled

Anchorage, ALASKA: A sled dog team mushes over frozen Willow Lake. Four-time Iditarod champion Martin Buser is in the running to become only the second musher to ever win a fifth race.

JIM WATSON