If I were to do this bind, I'd include DC Comics Presents #90, which is the Captain Atom/Firestorm/Superman team-up that predated the ongoing series by a year and was DC's first attempt to integrate Captain Atom into the DCU using the Bronze Age version that appeared in Crisis. They went in a different direction with the ongoing series, but it's an interesting artifact.  Maybe toss it in at the end as a bonus feature.