I just got an email from Guido van Rijn announcing publication of his book The St. Louis Blues of Walter Davis. I don't know anything about it other than what's available here: https://agramblues.com/the-st-louis-blues-of-walter-davis/. I imagine it's a lot like his Smokey Hogg book - as much biographical information as can be dug up, some musical analysis, and transcription and analysis of most of his lyrics.