About the author
Patricia Beatty (1922–1991) was brought up near the Quillayute Reservation, where she learned much about their culture and history. Her first book The Indian Canoemaker, 1953, was co-written with her husband John, Professor of History at the University of California Riverside. Together, they wrote eleven books, though Patricia wrote many more under her own steam.
Finding the books
Reasonably easy to find.
Links and sources
Patricia Beatty at the Children’s Literature Network (link no longer extant)
Patricia Beatty: obituary (Los Angeles Times)
The John and Patricia Beatty Award
Terri Wear: Horse Stories – An Annotated Bibliography
Thanks to Lisa Catz for the summary and picture.
Bibliography (horse books only)
I Want My Sunday, Stranger!
William Morrow & Company, New York, 1977, 254 pp
Thirteen-year-old orphan, Andrew, has raised his beloved horse, Sunday, from a foal, and now Sunday is his pride and joy, and the fastest horse in the San Bernardino valley. But when Andrew, a Mormon, is caught racing him, the Bishop tries to talk Andrew’s uncle into selling Sunday, to take the temptation away from him. The next morning, Sunday has gone, but he has been stolen. The boy makes his way east, searching for his horse which has been taken by the Confederates to
use in the Civil War.

Eight Mules from Monterrey
William Morrow & Company, New York, 1982, 192 pp
In 1916, Fayette journeys round California with her mother, establishing libraries.