Paul O'Neill Yankees No. 21 retired
What the Yankees' uniform number crunch could cost MLB's managers and coaches - The Athletic
Retired Uniform Numbers in the American League
Yankees retire Mariano Rivera's number
Yankees Retired Numbers - Who Are The 22 Yankees Who Wore Them
Yankees retire Posada's No. 20
History of retired numbers dates back to Lou Gehrig Day
Every Yankees Retired Number
History of retired numbers dates back to Lou Gehrig Day
New York Yankees to retire Paul O'Neill's No. 21 on Aug. 21 - The San Diego Union-Tribune
Every Yankees Retired Number
Yankees Retired Numbers
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