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Kathrine Switzer, who was the first official woman entrant in the Boston Marathon 50 years ago, acknowledges the crowd as she is introduced before firing the gun to start the women's elite division at the start of the 2017 Boston Marathon.
Kathrine Switzer, who was the first official woman entrant in the Boston Marathon 50 years ago, acknowledges the crowd as she is introduced before firing the gun to start the women's elite division at the start of the 2017 Boston Marathon.

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    No. 261 retired for marathon runner

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No. 261 retired for marathon runner

The Boston Marathon retired number 261 in honor of Kathrine Switzer, the first woman to officially run it.

No. 261 retired for marathon runner

The Boston Marathon retired number 261 in honor of Kathrine Switzer, the first woman to officially run it.