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"History of Motocross." Freestyle Motocross. N.p., n.d. Web. 10 May 2013. <http://www.freestyle-motocross.net/info/guide/fmx/history>.
"The Evolution of the Dirt Bike." Dirt Bike Riding Tips ~ Rider Tips, Ideas, and Resources for a safe ride. N.p., n.d. Web. 10 May 2013. <http://dirtbikeridingtips.com/the-evolution-of-the-dirt-bike.html>.
"History of Supercross | Supercross.com ." Supercross.com - Action Sports Entertainment . N.p., n.d. Web. 10 May 2013. <http://supercross.com/supercross-history/>.
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