I was crushed when I began reading the Black Stallion series as a child. The reason? No pictures. They were my first step away from the world of interior illustrations, and while the writing was wonderful and I loved the books, I missed the artwork. Perhaps you can see why.
Afraid To Ride, C.W. Anderson
Scorpion, Will James
Old Bones by Mildred Mastin Pace, illustrator Wesley Dennis
The Complete Morgan Horse (nonfiction), Jeanne Mellin
A Horse To Remember by Genevieve Torrey Eames, illustrations by Paul Brown
Rain Cloud The Wild Mustang by Margaret Kraenzel, illustrations by Pers Crowell
Ride The Wild Storm by Marjorie Reynolds, illustrations by Lorence Bjorklund
Of course, some editions of Walter Farley's books did have illustrations - above is Keith Ward's work from The Black Stallion.