Roberson: Time to let young Yankee players wear real numbers
ESPN - If future New York Yankees want a single-digit number, they're out of luck.
The New York Yankees Could Run Out of Jersey Numbers After Retiring Them - What Happens Next? - EssentiallySports
New York Yankees jersey number shortage - Sports Illustrated
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Yankees Retired Numbers: 5 Fast Facts You Need to Know
Yankee Stadium: Monument Park - Retired Numbers - Lou Gehr…
NEW YORK YANKEES ALL-TIME RETIRED NUMBERS 19”x13” COMMEMORATIVE POSTER
Yankees Retire Derek Jeter's No. 2 In Pregame Ceremony - CBS New York
MLB Bullets Paints By The Numbers - Bleed Cubbie Blue
Washington Nationals news & notes: Nats win 2 of 3 with Yankees; Stephen Strasburg set to retire; Stone Garrett update - Federal Baseball
Yankees want to stop issuing uniform numbers to managers, coaches because they're running out
Alex Rodriguez Calls Out Yankees For Not Retiring His Number
A mathematical examination of when the Yankees will run out of numbers to retire