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Retired number - Wikipedia
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NBA retires legend's jersey number in league-first
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Celtics Legend Bill Russell's No. 6 Jersey to Be Permanently Retired by NBA, News, Scores, Highlights, Stats, and Rumors
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The NBA Just Retired The Number 6 LEAGUE WIDE For Bill Russell!
Why was Boston Garden nearly empty when Bill Russell's number was retired in 1972? - The Boston Globe