The most obvious one is David Hajdu's Positively Fourth Street, which chronicles the intertwined lives of Richard & Mini, Joan and Bob -- and Richard's first wife, Carolyn Hester shows up, as well. It's a year or so old, and should be pretty easily available through Amazon.com and the like, if not your local bookstore.I disagree with some of the author's conclusions (but who am I?), though his research seems quite solid.