49ers uniforms: Best 49er to ever wear each number
San Francisco 49ers list of jersey number changes
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San Francisco 49ers: All-Time Top Players for Each Uniform Number
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2013 SMU Football Factbook by SMU Athletics - Issuu
San Francisco 49ers: All-Time Top Players for Each Uniform Number
2014 SMU Football Factbook by SMU Athletics - Issuu
2022 Northwestern State Football Media Guide by Northwestern State
49ers jersey number history: Best players to wear 1 through 4
49ers uniforms: Best 49er to ever wear each number