Not a 'baseball book' as such, however author and evolutionary biologist Stephen Jay Gould was a big baseball fan and wrote a few chapters in his fine work, FULL HOUSE. In 1986 he wrote about the extinction of the .400 hitter in a way that advanced baseball statisticians have come to accept. What with the 62 homer surliness, this is a useful read.
Here's a PDF of the relevant chapters:
https://web.colby.edu/baseball/files...0-hitter-1.pdf
Taking the time to read FULL HOUSE and Gould's other books is well worth every thinking man's time (chicks, too!)