There is now an updated version of the 60 Hikes Atlanta book available. You can get it on Amazon.com here. If you have a Prime membership at Amazon you even get free 2-day shipping.
In the latest edition there are some new trails included and they have updated information as well as supplying GPS coordinates in LAT/LON as opposed to UTM coordinates. I’ve already upgraded my copy and it continues to be a great resource, even better with the few updates.
You should definitely pick up a copy.