Hi Bryce, the book is coming along nicely. I've been researching it pretty exhaustively for 10 years now and I've just started the writing process this last year. I've been finishing up my Master's thesis concurrently too, so it’s been a little slow going initially. But that said I would expect to see it done in probably about 2-3 years.

While I've found a lot of obscure sources in regards to Shelby’s 1865 Expedition to Mexico I'm not sure much of it would be of too much use in regards to the 1864 Missouri Expedition, or at least anything new in regards to it. If you like though, I can email you a list of a few of the rarer sources that I have that might be relevant.

Matt