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Kevin ORing Lardner's "You Know Me Al" is my favorite Deadball book. Although it's technically fiction, it captures an early teens baseball season through the eyes of a clueless busher and his letters home. It's hilarious, and gives a dugout view of players like Cobb and Schalk and Bodie, and managers like Callahan and McGraw. It's available in the public domain: http://www.ibiblio.org/eldritch/rl/unomeal.htm