I thought you’d like to see Gernot Minke’s gallery. He’s one of the most experienced and knowledgeable earth builders around.
His book Earth Construction Handbook: The Building Material Earth in Modern Architecture is the most in-depth, practical book for those who want engineering details. It will set you back $101 at Amazon. Check your local library first. His book covers dozens of earth building methods. His pumice filled tubes were the first documented use of earthbags.