Big Open (Book) by Rick Ridgeway

On foot across Tibet's Chang Tang plateau, four mountaineers set out for the remote calving grounds of the endangered Tibetan antelope, the chiru, to follow its mysterious migration pattern. The mountaineers were Rick Ridgeway, Conrad Anker, Jimmy Chin and Galen Rowell. Galen Rowell died in a small-plane crash, just after returning from the Chang Tang expedition. These are among his last photos. Paperback. 304 pages.