Generally speaking, what sort of things DO these dwarves have access to as far as resources? I assume that if they've never been to the surface they don't have vegetables and grains and things like that; nor do they have timber; linens might be hard to come by; etcetera. Is there someone that trades with them? Do they have a small surface area in the mountains? Or do they produce underground equivalents?

I may need to go back and edit my post depending on the answer. If possible, I wanted my character to have a journal.