I have a lot of the Black Stallion books, but not 21. He also wrote the Island Stallion and I have a few of those too. The Marguerite Henry books were my parents go to for presents. I have most of her books, Misty of Chincoteague is my favorite. I still have all of my horse books I collected over the decades. But my favorite book of all time is The Chestry Oak by Kate Seredy.