Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
Yankees fans boo Hal Steinbrenner during Paul O'Neill ceremony
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Yankees GM Brian Cashman Backs Aaron Boone to Turn Fans' 'Slings' into 'Bouquets' – NBC New York
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Paul O'Neill (baseball) - Wikipedia
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New York Yankees history: Paul O'Neill's number 21 must be retired
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 Fans Boo Brian Cashman, Hal Steinbrenner at Paul O'Neill's Jersey Retirement - Sports Illustrated