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History of retired numbers dates back to Lou Gehrig Day
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10 Things You May Not Have Known About Lou Gehrig - Phi Delta Theta Fraternity
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Lou Gehrig - Wikipedia
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Lou Gehrig - Wikipedia
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Yankees retired numbers
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New York Yankees Retired Numbers - Sports Illustrated
Baseball In Pics on Instagram: “Lou Gehrig had his number 4 retired, and gave one of the great speeches in history on “Lou Gehrig Day”, July 4, 1939.”
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Lou Gehrig's disease: Why ALS is forever associated with one of America's baseball greats
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Gehrig's farewell speech still echoes in baseball, Professional sports
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Lou Gehrig, Biography, Statistics, Disease, & Facts
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Lou Gehrig MLB Career and Early Life, The Iron Horse
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An Awful Lot to Live For”: Lou Gehrig's Final Season in the News – The Unwritten Record