History of retired numbers dates back to Lou Gehrig Day

National Pastime Museum: LOU GEHRIG APPRECIATION DAY AT 75 – Marty Appel

High and Tight: Our Rock & Roll Baseball Experts Talk Retired Numbers

An Awful Lot to Live For”: Lou Gehrig's Final Season in the News – The Unwritten Record

Lou Gehrig at age 29, of The New York Yankees in spring training prior to his 1933 Triple Crown year. Less than 6 years from retiring with ALS that killed him 2

On This Day, July 4: Lou Gehrig announces retirement

Jeter's retirement marks end of Yanks' single-digit numbers

Yankees Top Moments: (#1) Lou Gehrig's Luckiest Man speech vs. (#8) 1941 World Series strikeout turned win - Pinstripe Alley

Yankees retired numbers and the baseball legends who wore them

Yankees Retired Numbers