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WikiPedia: Chó kéo xe http://www.alaskadispatch.com/article/dogsled-mail... http://www.biomedcentral.com/content/pdf/1471-2156... http://www.britannica.com/EBchecked/topic/548532 http://books.google.com/?id=-9Nh2I9J0mUC&printsec=... http://books.google.com/?id=FLfNdyiDs-EC&printsec=... http://books.google.com/?id=bLSw9pATz5gC&printsec=... http://books.google.com/?id=scRaxgw1QiYC&printsec=... http://books.google.com/books?id=L6Y8AAAAYAAJ&prin... http://books.google.com/books?id=PYdBH4dOOM4C&pg=P... http://books.google.com/books?id=fhygAAAAMAAJ&pg=P...