I can see some subcategories for that giant hugels, pot hugels, char hugels, things that
root too easily to use, pit hugels, how to make the tall ones harvestable, how to balance layout between
solar orientation and slope, failures to learn from, methods for including large logs, successful microclimates from hugels.
Intermountain (Cascades and Coast range) oak savannah, 550 - 600 ft elevation. USDA zone 7a. Arid summers, soggy winters