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1968 Olympic Games, Mexico City, Mexico, Swimming, Women's 400 Metres Freestyle, USA's Debbie Meyer breaks the Olympic recoed in the heat (Photo by Popperfoto/Getty Images)

1968 Olympic Games, Mexico City, Mexico, Swimming, Women's 400 Metres Freestyle, USA's Debbie Meyer breaks the Olympic recoed in the heat  (Photo by Popperfoto/Getty Images)