From MLB Power Pros Wiki

Item Description

Legendary Players of Baseball, also known as Legends of Baseball is an item in Success Mode 2007 and 2008.

The book is not sold at Bison's Shop but can be found inside a Surprise Bag. It can be used on the inventory screen to gives one of two abilities, depending on the player's main position:

Fielders

• Power Hitter
• Contact Hitter

Pitchers

• Fastball Life 4
• Spin 4