The cover corresponds to DC Comics' Action Comics #266.
Buzzy says: "Free Speech--Free For All!"
Superman: "The Captive of the Amazons" (Action Comics #266)
Supergirl: "The worlds mightiest Cat!" (Action Comics #266)
Jerry the Jitterbug
Tommy Tomorrow: "The trial of Tommy Tomorrow" (Action Comics #240)
Giants of the telescope
Superman: "Secret of the superman sphinx" (Action Comics #240)
Jerry the jitterbug
Front and Back Covers (Retro ad fro Jaxon Lads):
Here is DC's original cover for comparison: