Here are some sketches from the Ken Hultgren book. I was able to purchase one online for eight bucks! It is obvious after studying it, that the Preston Blair book is based upon it, with the concepts and their order refined. The Hultgren book is based upon pen and ink techniques. Why should you acquire it? For all the cartoon character examples, for the inspiration. It was published in 1946, and the costumes the characters wear represent styles from 60 years ago. The hultgren book explores a lot of different concepts to animation, but not with a coherent strategy.