The Yankees have retired so many numbers that they're down to just four available for new recruits: 38, 50, 57 and 69. : r/baseball
Yankees Retired Numbers
Yankees retired numbers
Yankees retire Mariano Rivera's number
List of Major League Baseball retired numbers - Wikipedia
The 24 best players in New York Yankees history
Paul O'Neill: New York Yankees to retire jersey number
Yankees retired numbers
Yankees retired numbers and the baseball legends who wore them