Here are a few books on early California baseball that I have in my own collection. I can recommend them all:
John Spalding's Pacific Coast League Stars Volume 1:
https://www.amazon.com/Pacific-Coast...t+league+stars
John Spalding's Pacific Coast League Stars Volume 2:
https://www.amazon.com/Pacific-Coast...stars+volume+2
John Spalding's Always on Sunday:
https://www.amazon.com/Always-Sunday...palding+sunday
Dick Dobbins' Nuggets on the Diamond:
https://www.amazon.com/Nuggets-Diamo...s=dick+dobbins