Here is a list and links to a number of books written in the late 1800’s, early 1900’s on Fireless cooking. They contain some great info on the method from recipes to how to make them and how to use some that were being sold at that time. These Fireless Recipe books are directly applicable for use as recipes in a thermal cooker, wonder box, wonder oven, hot box, hay box, or other retained heat cooking methods. The following are available to read and download online but are also available in reprinted books for purchase or to download on your Kindle.
Book of Caloric fireless cook stove recipes; a compilation of more than three hundred superior recipes of all kinds, meats, game, poultry, fish, cereals, vegetables … etc., especially adapted to the new Caloric fireless cookstove ([c1908])
http://www.archive.org/stream/highlivingrecipe00mcla (to view book)