I spent a couple of hours at the Williamson County Archives today. It's very convenient and at the most a 5 minute drive from my house. I don't have any known ancestors in Williamson County, Tennessee. So why do I go to the county archives? Although the holdings are not as large as a state archive or a big city library, they have sources there that are very useful, a few of which are not at the state archives. It is the same with Williamson County Library, which is maybe a 10 minute drive from my house. They have a wonderful Special Collections room.