On my last trip in October to the Blue Ridge Parkway, I purchased "The Blue Ridge Parkway" from the Postcard History Series books at one of the visitor centers.
Despite it's name, it is actually a collection of historic postcards all the way from Shenandoah National Park to the Great Smoky Mountains National Park and the Blue Ridge Parkway in between.
The book written by Karen Hall with the Friends of the Blue Ridge Parkway has a great variety of postcards. Some of them are of the motels, and other business establishments that the area was famous for. Others are "real-photo" type cards highlighting areas along the BRP and the surrounding area.
If you grew up going to the Blue Ridge or the Smokies then this is a book you will really enjoy as it will bring back memories of childhood. If you didn't grow up in the area, you'll understand a lot more about the "days of old" in the area when you hear about it.