Bill Russell's No. 6 is being retired across the NBA : NPR
MachineLearningFinal/preprocess_data/412208 at master · Kleptine/MachineLearningFinal · GitHub
The Retired Numbers Project: Number 6 – Bill Russell - The Sports Daily
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Bill Russell given Jackie Robinson treatment as NBA retires No 6 jersey, NBA
Bill Russell's No. 6 Joins Rare Class of Retired Jersey Numbers - The New York Times
Bill Russell's No. 6 is being retired across the NBA : NPR
NBA to retire Celtics legend Bill Russell's No. 6 leaguewide - Los Angeles Times
Fans react as NBA announces that the late Bill Russell's number 6 jersey will be retired