Action Comics #274 VF (8.0)
Lois Lane as Superwoman! Supergirl back up story
Action Comics #276 VG (4.0)
1st appearance of several Legionaires, Brainiac 5, Sun Boy, Phantom Girl, Triplicate Girl, Shrinking Violet, Supergirl joins the Legion
Action Comics #280 VF- (7.5)
Supergirl origin story! early Brainiac appearance! Slight edge creaming
Action Comics #288 VF/NM (9.0)
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 #299 VF/NM (9.0)
Superbaby and Supergirl cover and story! Superman's amazing robots!
Action Comics #312 VF+ (8.5)
Superman cover and story, Superhorse, Lori Lemaris, and Lana Lang appear, Supergirl back up story
Action Comics #313 VF/NM (9.0)
Superman cover and story, Lex Luthor, Superhorse, Lori Lemaris, and Legion of Super-Heroes appear, 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 #317 NM- (9.2)
Superman and Supergirl stories, this black cover issue is tougher in higher grades