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Bert Blyleven, you are hereby circled: A memorable run in the Twins booth ends - The Athletic
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Today in Baseball History: Len Barker throws a perfect game - NBC Sports
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Oliva, Kaat hoping call from the Hall finally comes
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July 16, 2011, Blyleven's number retired
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Blyleven reaches rare mark with 250th win
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Jack Morris - Wikipedia
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Bert Blyleven – The Twins Almanac
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Bert Blyleven Through The Years - Sports Illustrated