FILE - Gunnar Kaasen and with his dog Balto, the heroic dogsled team leader, sit for a portrait in the early 1920s. (AP Photo, File)
FILE - Gunnar Kaasen poses with his original dog team, including his lead dog Balto, top row, second left, in 1925, which he drove through a blinding blizzard to deliver life-saving serum, in Nome, Alaska. (AP Photo, File)
FILE - The statue erected to honor "Balto" and other heroic sled dogs who carried serum to Nome, Alaska, through an Arctic blizzard is covered in snow in New York's Central Park, Dec. 11, 1947. (AP Photo/Anthony Camerano, File)
In this image published on Jan. 23, 1928, and provided by the Library of Congress, Prints and Photographs Division, NYWT&S Collection, shows Leonhard Seppala winner of the first annual sled dog race held at the Lake Placid Club Seven teams competed in Lake Placid, N.Y. (Library of Congress, Prints and Photographs Division, NYWT&S Collection via AP)
FILE - Leonhard Seppala and his sled dog team are pictured on Oct. 12, 1928, in Alaska. In 1925, Seppala was part of the nearly 700-mile relay of mushers and dog teams to get diphtheria antitoxin to Nome, Alaska, during a deadly outbreak of the disease. (AP Photo, File)
FILE - Leonhard Seppala poses for a photo in 1928, in Alaska. In 1925, Seppala was part of the nearly 700-mile relay of mushers and dog teams to get diphtheria antitoxin to Nome, Alaska, during a deadly outbreak of the disease. (AP Photo, File)
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FILE - Gunnar Kaasen and with his dog Balto, the heroic dogsled team leader, sit for a portrait in the early 1920s. (AP Photo, File)
