It was Kesey's last novel and is about the famous "Last Go Round" that took place at the original Pendleton Round-Up in 1911.
The book contains references to real historical figures, and was published with photographs from the early days of the Pendleton rodeo.
However, the story is written as a tall tale, with characters and feats that are larger than life.
You can help Wikipedia by expanding it.See guidelines for writing about novels.
Further suggestions might be found on the article's talk page.