Summer comics: The Justice League team-ups

In the 1970s, it became a summer tradition for DC Comics' Justice League of America to team-up with their Earth 1 counterparts, the Justice Society, and other heroes from parallel worlds, including the Seven Soldiers of Victory, the Freedom Fighters and the Marvel Family.

I was there for most of them, and I have fond memories of reading these comics on family trips, leafing through them in the back of the car (and trying not to get sick) and in the tent on camping trips when it started to rain outside.

Here's a cover gallery of those 70s issues.