At a scant 52 pages it was an easy way for children to learn about the man who created The Muppets. You now, before the the internet made knowing every detail about everything at our fingertips at all times.
I first came across this book at my elementary school's library where, after searching the card catalog (hey kids remember those?) this was the single book on Jim Henson.
While this book may be out of print, it can still be found very reasonably priced from amazon.