This is a book my son got me for Christmas. I would very much like to have an earth oven someday and this book definitely tell you how to build one. It seems a very simple process but I really think I will read over the whole book before I attempt it. Mine, however, would not be nearly as fancy as the one of the cover (there are some color picture inserts in the middle of the book that show earth ovens that are more artistic). I just want the simple earth oven like the one on page 33 of the book.
Although what I would really like is to have one with the fire underneath. It seems that is not as easy as one with a fire right inside and I'll have to read up on it some more.
To make one of these you basically need sand, clay (got enough clay here in GA!), straw, glass bottles and water. You can use bricks, stone etc. for the bottom if you wish. You also need some way to cover it and keep it out of the rain, but a tarp will do until you find or build something else.
The book also includes chapters on how to make your own mud bricks, making sourdough, cooking in your earth oven, other types of ovens and kilns, making utensils for you oven, etc.
It's a small but very good book and I shall be collecting up materials to see if I can get one of these made.