49ers' abundance of retired numbers added to laundry list of
McCaffrey bypasses Gore's No. 21 to become SF 49ers' new No. 23
Frank Gore announces he will retire with the 49ers in the next few
Bo Knows DFS – Nimble w/Numbers
My jersey collection.. which jerseys are in yours? : r/49ers
The season ends. Whew. But what did we learn?
Roger Craig (American football) - Wikipedia
Why Christian McCaffrey didn't wear Frank Gore's No. 21, per John
Autographed San Francisco 49ers , Autographed 49ers Collectibles
Bo Knows DFS – Nimble w/Numbers