Chapter 19
1. The Evolution of the Horse in America, Osborn, in _The Century_, November, 1904.
The Evolution of the Horse, Matthew.
2. The Horse, Flower.
3. Encyclopedia Britannica, article, _Horse_.
1. The Evolution of the Horse in America, Osborn, in _The Century_, November, 1904.
The Evolution of the Horse, Matthew.
2. The Horse, Flower.
3. Encyclopedia Britannica, article, _Horse_.