Johanna Maria Elisabeth "Jopie" Waalberg (13 April 1920 – 5 July 1979) was a Dutch breaststroke swimmer who competed in the 1936 Summer Olympics and was the first woman to swim the 200 meter breaststroke under 3 minutes.In 1936 she finished fifth in the 200 metre breaststroke event, the single breaststroke event until the 1968 Olympics.
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