I got this through a used book dealer: Visions & Revisions: The Poet's Process by Barry Wallenstein and Robert Burr (Broadview Press, 1971, 2001). The book discusses drafts and final poems written by poets as diverse as William Blake, John Keats, Sylvia Plath, Robert Lowell and Alicia Ostriker. I am reading it ahead of my class on revision--seeing what the book might add to our discussion.
The book is in near perfect condition.
I love it when things are actually as they are represented.