What are the names of the books in the middle right?

The girl on the rocking horse is 2 or 3 years old, so this photo was taken in 1965 or 1966. The boy is 12 or 13 years old, and the books have been said to belong to him. This means that the books are from between 1953 and 1966 if the books were published and given to the boy in his lifetime. Or, the books, which look like they are part of the same set based on their designs, are from before 1953.