I don't know about a book, but there is a really good database at ancestry.com - South Carolina, U.S., Wills and Probate Records, 1670-1980:
https://www.ancestry.com/search/collections/9080/
From a quick look just at Edgefield County, it appears that there are multiple wills just for Doby.
Could you focus what you are looking for a little better? Name and dates?
If you don't have ancestry.com, I am sure that someone that does would be glad to look for you.
Family search has the bound volumes for probate which might help you
South Carolina Probate Records Bound Volumes, 1671-1977, go to this link and select the county you need
http://www.familysearch.org/search/image/index?owc=https://www.familysearch.org/service/cds/recapi/collections/1919417/waypoints