A somewhat different take on dwarven culture, here describing a society based on a combination of democracy and slave-ownership (with more of a nod to Ancient Greece than to, say, the Antebellum South). I doubt it would be useful as a description of a 'default' dwarven society in many games, but it could work as an isolated nation in some corner of a campaign world.
The society itself is mostly well-described, although there are a few holes here and there. The sections on history and culture are followed by a sort of dwarven version of freemasonry, complete with a prestige class based around mystical abilities, and a second prestige class for the NPC leadership of the group. This is generally well thought out and atmospheric, and one could see it being useful in other campaigns with the right sort of background.
Finally, there are some monsters suitable for an area dominated by dwarves, and, somewhat incongruously, a chapter on what are essentially human gypsies. In general, it's a good book, albeit with a few gaps and oddities, and not suitable for every campaign.