The rest of the TBB series, as you know. Get the ones you don't have. Each has helpful information. "Making Indian Bows and Arrows the Old Way" by Douglas Spotted Eagle. Written in a pretty unique tone. There might be a couple of minor points of disagreement with other sources, but I just don't think he would be too interesting in aruging about it. Very pleasant read.
It's not a "bow building" book, Jim Hamm's "Ishi and Elvis" has, as part of the story, some good pointers. It isn't designed to complete a bow from start to finish, but has some neat information that he uses as part of his story.
Those are what I have to reccommend at the moment. I want to get some others, but those have gotten me a long way already.