Action Comics #274 VF (8.0)
Lois Lane as Superwoman! Supergirl back up story
Action Comics #280 VF- (7.5)
Supergirl origin story! early Brainiac appearance! Slight edge creaming
Action Comics #283 VF (8.0)
Legion of Super-Villains and Mr Mxyztplk appear!
Action Comics #290 VF+ (8.5)
All Red Kryptonite issue! Great time period in Action & Superman comics!
Action Comics #299 F/VF (7.0)
All Red Kryptonite issue! Great time period in Action & Superman comics!
Action Comics #320 CBCS 9.4
Superman vs Hercules, Samson, and Atlast. Supergirl back up story!
Action Comics #322 VF (8.0)
Looks considerably better, but small corner tear bc.
Action Comics #340 CGC 9.0
1st appearance of the Parasite, who has appeared in numerous animated series and more recently in the Supergirl TV series!