Will look it up. Incidentally, I'm going to finish up an episode tonight that I've been working on which briefly mentions Willard.
If you are looking for heavyweight stuff pre-1970's, there are the Adam Pollack books, they are all excellent and extensively researched. Randy Robert's books on Jack Dempsey and Jack Johnson are great. I fought them all, the book on Sailor Tom Sharkey is a good read too.