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2rocketjk
Athough not a straight McGraw biography, the book The Old Ball Game: How John McGraw, Christy Mathewson, and the New York Giants Created Modern Baseball by Frank Deford is excellent and includes a lot of biographical material on both men. A very good book, indeed, in my opinion.
3lucienspringer
There's a book unimaginatively called John McGraw by Charles Alexander that should cover all your bases, no pun intended.