Horse and Pony Books:
(DIAL PRESS [USA] 1965)
(1st UK edition Scholastic 1968)
ILLUSTRATED BY HENRY PITZ
Reprinted in paperback by Scholastic in USA and UK with new illustrations by Leo Summers.
EDITIONS PICTURED: 1st edition, Scholastic paperback.
SUMMARY: When Roberto's father is killed trying to capture the notorious wild horse Diablo Blanco, he vows to have nothing more to do with horses. But when a reward of $1000 is offered to catch a mustang, he changes his mind. Under the guidance of the Comanche Indians, he becomes an expert horseman and determines to capture the wild horse for himself.
Easy to find in the USA, especially the paperback. The book was also reprinted by the London branch of Scholastic and this paperback edition is fairly easy to find here. The book is however a lot harder to get hold of elsewhere.