49ers Sign LB NaVorro Bowman to Four-Year Contract Extension
NaVorro Bowman's contract sealed by 49ers' veterans
2013 San Francisco 49ers season - Wikipedia
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Pro Football Journal: SF 49ers: All-Time 3-4 Top Seasons
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Morning Report: 49ers Sign Offensive Lineman to One-Year Deal
NaVorro Bowman agrees to four-year contract extension with 49ers - ESPN
NaVorro Bowman of San Francisco 49ers leaves game with lower leg injury - ESPN
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