you can't find them online. you'll have to go to amazon.com to buy them or to a bookstore or library. they are all by kathleen dewey.

my grandma found the book on strider aka spirits father on sale at the libary

The book titles are Esperanza, Bonita, Sierra, and Spirit. Spirit is just the novelization on the film. and the others are about Spirit and Rain's ancestors. The series itself is called Spirit of the Cimarron. Esperanza is about Spirit's mom and dad. Sierra is about Rain's parents. Bonita is about Rain's grandparents.

Well yes there is a series of the books.They are very good.But there is no where online to read them.But if you really want them,try the liabary.If they have none,the best place is to go on Ebay.They have the books on there for a pretty good price.Hope this helps!