"The Year Babe Ruth Hit 104 Home Runs" by Bill Jenkinson.
An incredible bit of research on every single game played by The Babe. Including post-season and exhibition games. Even though there was no TV, you had several newspapers covering each game. So Jenkinson was able to come up with distance estimates for each and every home run and long fly ball hit by Ruth, and estimates that in modern ballparks, he would have hit over 1,000 home runs in his career, including over 100 in 1923 alone.
Back when he played, centerfield at Yankee Stadium was 490 feet away... And the rule was that a ball going over the fence was fair or foul depending on where it landed, not where it left the field.
Lots of great anecdotes about just how great Babe Ruth was. Makes you appreciate him all the more.