I'm getting back to adventure writing with an adventure involving the Dwarven Mountain (Outlands), the divine realm of the dwarven gods Vergadain (wealth, trickery, luck), Dugmaren Brightmantle (invention, discovery, scholarship), and Dumathoin (mining, secrets, underground exploration, funerary).
What are the best D&D books (any edition) that I should refer to as I'm writing this up?
Of course, for the realm itself there's the Planescape Campaign Setting boxed set, some mention in On Hallowed Ground, and a brief blurb in the Player's Primer to the Outlands.
What about the deities themselves? The most informative I've found so far has been AD&D Demihuman Deities. AD&D Monster Mythology has a few tidbits too. Anything else?