Dwarven Nations Trilogy
I base my vision of a typical Dwarven kingdom on the descriptions at the beginning of "The Covenant of the Forge" by Dan Parkinson (TSR, 1993). The city is located within the mountain and a fortified structure exists on the front of the mountain. For agriculture the Dwarves have the slopes of the mountain below farmed. Once per year they have a big trade gathering in the valley below their city where everyone is welcome. This is what I always envision when I thing of Dwarves. Having said that, if they seal the mountain door, they are able to exist quite happily, though without the creature comforts they would prefer. I'm actually working on an all dwarven adventure right now and Races of Stone has some very good information reguarding the way dwarves behave and think. This will be key for me to share with my players because they are all Elves (at least that is what they always play).