I have both books and found them each useful in their own way. However, they are very different books. Tim's book is mostly a "How To" concentrating on later, more sophisticated bags. Jims book is his "sketchbook" of southern appalachian bags, powder horns, moulds, knives, etc.... There is sufficient information given to recreate the bags although I wouldn't call them patterns. Tim's books actually has patterns. This is in no way meant to denigrate Jim's book. It is actually one of my favorites. Just don't expect a "How to" with exact patterns laid out on a grid.
Mark
