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U.S., led by Allyson Felix, qualifies for women's 4x400 relay final at World Athletics Championships - oregonlive.com
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U.S. Men Win 4x400 Meter Relay And Get The Team's First Track Gold In Tokyo : Live Updates: The Tokyo Olympics : NPR
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Athletics - World Athletics Championships - Women's 4x400 Metres Relay - Heats - Hayward Field, Eugene, Oregon, U.S. - July 23, 2022 Belgium's Helena Ponette, Belgium's Imke Vervaet, Belgium's Naomi Van Den
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World Athletics 2017: USA reclaim 4x400m title and GB take silver as Jamaica suffer more injury woe - Eurosport
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