https://en.wikipedia.org/wiki/Baseball_(ball)
Portsmouth Square:
https://ourgame.mlblogs.com/the-knickerbockers-san...
Recreation Grounds:
https://en.wikipedia.org/wiki/Recreation_Park_(San_Francisco)
Haight Street Grounds:
https://hoodline.com/2016/03/the-forgotten-history...
Central Park:
https://www.foundsf.org/index.php?title=View_South...
Ewing Field:
https://www.foundsf.org/index.php?title=Ewing_Fiel...
Seals Stadium:
SF Giants
Candlestick Park: SF
Giants
Oracle Park:
https://en.wikipedia.org/wiki/Oracle_Park#/
