Though this set was originally compiled in the 1970s, it seems almost as if they had Logos software in mind with the design. You can flip to the doctrinal index, find a topic, and then immediately go to a passage from the Early Church Fathers that references that topic. In Logos, there's no more flipping back and forth to the endnotes. And you can even, often, go straight to the fuller context of any given quote in the 37 volume Church Fathers set. I've had this set in print for years and have loved it, but with Logos, these books truly reach their full potential.