New York Yankees history: Paul O'Neill's number 21 must be retired
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
Yankees Stadium Hijacked by Boos as Infuriated Fans Proclaim Frustration During Jersey Retirement Ceremony for Shocking Pinstripes Slump - EssentiallySports
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Yanks' Cashman backs Boone to turn `slings' into 'bouquets
New York Yankees retire Paul O'Neill's No. 21; GM Brian Cashman, owner Hal Steinbrenner booed by fans - ESPN
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Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed - The San Diego Union-Tribune
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