There are some good articles online about that exhibit on google, if you put in "southern lynchings photographs" in the search line.

While looking at them I came across a slideshow/movie, Without Sanctuary, of one man's collection of those types of photos with his own commentary. It is a stunning and vivid portrayal of how matter-of-fact the whole thing was. It takes a strong stomach to view. When I saw the back of a postcard which said "This is the barbecue we went to last night...your son, Joe" and then the front of the postcard, I had to turn away. This was America of those times.

If your modem is slow or you don't want to look at the pictures collected, I would urge you to read the full text of his commentary. It is excellent. This is a site which will haunt me for a long time. If you are interested, please click here