San Francisco Seals, Ice Hockey Wiki
MLB: The Defunct Saga - Bibliography Added - Page 11 - Concepts - Chris Creamer's Sports Logos Community - CCSLC - SportsLogos.Net Forums
1909 San Francisco Seals season - Wikipedia
List of baseball parks in Oakland, California - Wikiwand
File:Carl Zamlock, San Francisco Seals, 1911.jpg - Wikimedia Commons
San Francisco Seals (baseball) - Alchetron, the free social encyclopedia
The PCL: San Francisco Seals – Ebbets Field Flannels
The Local Nine: San Francisco Seals Baseball, 1903-1957
The forgotten story of Joe DiMaggio and the San Francisco Seals talent factory, New York Yankees
File:(Claude Berry, catcher, San Francisco Seals, 1910, Obak cigarette card) (9357207305).jpg - Wikimedia Commons
San Francisco Seals (PCL), Pro Sports Teams Wiki
San Francisco Seals (PCL), Pro Sports Teams Wiki