Action Comics #298 VF (8.0)
Superman vs Super Luthor! Supergirl story! General Zod and Legion of Super-Heroes appear
Action Comics #299 VF+ (8.5)
Superbaby and Supergirl cover and story! Superman's amazing robots!
Action Comics #300 VF+ (8.5)
Superman as the Last Man on Earth! Supergirl story
Action Comics #300 VF- (7.5)
Superman as the Last Man on Earth! Supergirl story
Action Comics #307 NM- (9.2)
Supergirl cover and story, Legion of Super-Heroes appears
Action Comics #310 VF+ (8.5)
Superman & Jimmy Olsen vs. the Phantom Zone villains cover and story!
Action Comics #314 VF+ (8.5)
Superman and Flash cover and story, Supergirl back up story
Action Comics #317 VF+ (8.5)
Superman and Supergirl stories, this black cover issue is tougher in higher grades
Action Comics #322 VF (8.0)
Looks considerably better, but small corner tear bc.
Action Comics #329 VF (8.0)
Superman cover and story, Supergirl back up story
Action Comics #333 VF- (7.5)
Superman cover and story, backup story features a grown up Supergirl vs. Superboy
Action Comics #334 VF+ (8.5)
Giant issue featuring Supergirl, Superman, Superboy, and the Legion of Super-Heroes, Super-Pets
Action Comics #336 VF- (7.5)
Superman, Supergirl, and Super Horse cover and story