The old Pacific Coast League.
Joe Bratcher – Society for American Baseball Research
Pacific Coast League Baseball in Emeryville: The History of the Oakland Oaks Ballpark - The E'ville Eye Community News
Oakland Oaks of 1948
1918. Oakland Oaks Baseball Season Opens (4K).
Oakland Athletics - Wikipedia
1919 Vernon Tigers were wild, dangerous in Pacific Coast League
Missoula, 'Bullet Joe' and baseball history
Spring Training 1946
Baseball in Hayward — Hayward Area Historical Society
MLB INSIDER: Cleveland Indians' manager Manny Acta not the only underachiever – Morning Journal
Oakland Oaks Opening Day - April 2, 1918
Oakland Oaks Opening Day, 1918., 4/2/1918. Opening day for the Oakland Oaks. Auto parade through downtown streets and pregame warmup., By OTDinBaseball
Oakland Oaks vs. San Francisco Seals baseball opening. 1918-04-02]