Can we name every Yankees Retired Number in numerical order?
Yankees retire Paul O'Neill's No. 21 jersey, Cashman booed
Yankees want to stop issuing uniform numbers to managers, coaches because they're running out
ESPN - So, the New York Yankees are kind of running out of jersey options
Yankees Retired Numbers
Have the Yankees taken retired numbers too far?, Bronx Pinstripes
All-time best Yankees by jersey number (1-33)
Yankees to retire Paul O'Neill's No. 21: See the complete list of retired numbers
Southern California teams' retired numbers – Orange County Register