I recently saw "Disater Medicine" spoken well of on another board, here's the link;
http://www.amazon.com/gp/product/032...Fencoding=UTF8
I have not read it, and it may be a bit outside of what we're discussing here (i.e. it seems like a book you'd keep as a reference if you were "bugging in" or might like to have read before bugging out, rather than something you'd include in your BOB), but it looks interesting.