We all know that family histories, local histories, indexes of vital and the sort are awesome for finding nuggets of gold.  Check out FamilySearch’s Family History Books beta site:

http://books.familysearch.org/

Second link, courtesy of Mark Lowe: Bouvier’s Law Dictionary, which can be found in google books:

Notice the dates? These were the references that law clerks and the like used as reference in the 1800’s in the south.  Want to know about what a drove-road is and what it means? The information is there.

Remember, don’t look if you just have two minutes! Trust me!