One of my favorites, "The Last Best League." Great book about young, amateur players trying to get into the big leagues.
http://www.amazon.com/The-Last-Best-League-Summer/dp/0306814188
If you have yet to read a Ruth biography, I'd strongly recommend one. This one,
http://www.amazon.com/Babe-Legend-Co...ruth+biography, doesn't deviate much into anything but his life- no Black Sox, Gehrig, or much else- but no such deviation is really needed; Ruth's entertaining enough.