US women win gold in 4x400 relay - 2011 Track & Field Worlds
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Sept. 3, 2011: Sanya Richards-Ross and Allyson Felix lead the United States in a dominant effort for gold in the women's 4x400m relay final.
Sept. 3, 2011: Sanya Richards-Ross and Allyson Felix lead the United States in a dominant effort for gold in the women's 4x400m relay final.