San Francisco Sourdough History - Sourdough Bread, Then & Now
San Francisco 49ers - Wikipedia
San Francisco 49ers - Wikipedia
The sourdough self-starter
Sourdough Sam, American Football Wiki
Hooray for 20 years of Wikipedia!
June 1, 2023: Volume XCI, No. 11 by Kirkus Reviews - Issuu
Sourdough Sam, @David_Papato Wiki
November 20, 2021 – Air Mail
Victories, Defeats and the Science of Sports - The New York Times
Choosing Sides: How To Pick Between The Ravens And The 49ers : NPR
Choosing Sides: How To Pick Between The Ravens And The 49ers : NPR
An Unofficial Ranking of NFL Mascots - Your AAA Network