I have not had the chance to read that paper but would like to. I enjoy anything I can get my hands on regarding southern rifles and gunmakers.
Dr. Whisker's other books that I have seen usually don't have a lot of detailed text about how gunsmithing evolved in the region, schools/styles within the region, timeframes etc. They are usually mostly photos, 3-4 per gun, with minimal descriptions or text other than a very brief section of gunsmith bios/ period references for those that are identified. The photos are usually good quality - not as many detail shots as Shumway, but enough to give you a good introduction to the guns. Sometimes the attributions of various rifles shown are very loose, but he always makes the distinction of "attributed to" in the cases where it is uncertain. I like southern rifles, so I think it sounds like something I would buy.
Guy