Action Comics #281 VF/NM (9.0)
Superman and Jor-el cover and story, Supergirl appears
Action Comics #283 VF (8.0)
Legion of Super-Villains and Mr Mxyztplk appear!
Action Comics #286 VF/NM (9.0)
Superman vs. Lex Luthor, Brainiac, and the Legion of Super-villains. Supergirl backup story
Action Comics #288 VF/NM (9.0)
Superman cover and story, Supergirl story, Mon-el appears
Action Comics #288 VF- (7.5)
Superman cover and story, Supergirl story, Mon-el appears
Action Comics #292 VF+ (8.5)
Superman vs Luthor cover and story! Supergirl story
Action Comics #294 NM- (9.2)
Superman vs Luthor cover and story! Supergirl story
Action Comics #294 VF/NM (9.0)
Superman vs Luthor cover and story, Supergirl story
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 #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