History of retired numbers dates back to Lou Gehrig Day

Lou Gehrig Day's reminder of why your help is still needed National News - Bally Sports

Mariners putting on ALS Awareness Night before MLB's Lou Gehrig's Day

Yankees to retire Paul O'Neill's No. 21: See the complete list of retired numbers

Lou Gehrig New York Yankees Nike Cooperstown Collection Name & Number T-Shirt - Navy

Lou Gehrig's number is retired by the Yankees on July 4th

The retired numbers of Lou Gehrig, Babe Ruth, Joe DiMaggio and Mickey News Photo - Getty Images

Ruth, Gehrig and the first Yankee dynasty, Bronx Pinstripes

History of retired numbers dates back to Lou Gehrig Day

Lou Gehrig: Streak Consecutive Games Ends - Sports Illustrated NY Yankees News, Analysis and More

Lou Gehrig's disease: Why ALS is forever associated with one of America's baseball greats

Every MLB team's retired numbers