WHITE HORSES AND BLACK BULLS
ILLUSTRATED BY VICTOR AMBRUS (including cover)
Also published in America by Norton in 1960 and 1963.
SUMMARY: Set in the Camargue region of France, home of wild white horses and black bulls. Young Paul falls in love with the wild creatures of the Camargue, especially the Tangled Mane horse which he hopes to make his own.
Oddly, the American edition is actually easier to find than the original English edition which is also usually more expensive.