Claim: Sonora Webster Carver (one of the first female horse divers) wrote an autobiography called, A Girl and Five Brave Horses, which was 422 pages long and published by Doubleday.
Evidence: Sonora Webster Carver (February 2, 1904 – September 20, 2003), born in Waycross, Georgia, was an American entertainer, most notable as one of the first female horse divers. Sonora's account can be read in her 1961 book, A Girl and Five Brave Horses, and seen in the fictionalized movie version of her life, Wild Hearts Can't Be Broken, starring Gabrielle Anwar. 
A Girl and Five Brave Horses is a memoir by Sonora Webster Carver published in 1961. A Girl and Five Brave Horses Sonora Webster Carver Autobiography 224 pp (hardcover) Doubleday