How Paul O'Neill Stacks Up Against the Other Yankees With Retired Numbers
Paul O'Neill's Number 21: The Weird Yankees Scandal You Don't Remember
New York Yankees history: Paul O'Neill's number 21 must be retired
Paul O'Neill dishes on Yankees (then and now), life in YES booth and being 'blown away' by retired number
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Yankees will retire Paul O'Neill's No. 21 jersey in August at Yankee Stadium's Monument Park
New York Yankees Archives - Sportscasting
Yankees to retire Paul O'Neill's No. 21 on Aug. 21
Opposing fans need to shut up about Yankees retiring Paul O'Neill's number
Paul O'Neill's No. 21 journey started at his first MLB game
As Paul O'Neill's No. 21 Is Retired, One Last Kick of a Water Cooler - The New York Times