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DMcDA great companion to Glory of Their Times would be Baseball's Golden Age: The Photographs of Charles M. Conlon by Neal McCabe and Constance McCabe. Many beautiful Conlon b&w photos of our cardboard heroes. Amazon has copies. The indispensable SABR Deadball Stars volumes with all the mini-bios would fit right in with Ritter and the Conlon book.
I just discovered Ron Kaplan's Baseball Bookshelf. Looks like it might be a good resource on the subject of baseball books. http://rksbaseballbookshelf.wordpress.com/