Bibliography     Helen Kwon "Physics of dog mushing" http://helenx1oo4.tripod.com/physicsofmushing/   "Village Science" http://www.uaf.edu/ankn/VS/dogsleds.html   Alyeska dogsled works http://www.boreal.org/alyeska/index.html   Serway, Beichner Physics For Scientists and Engineers Fifth Edition Thomas learning Inc. 2000