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DC Mar 1960

Action Comics #262

Action Comics #262
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Introduction of the concept that Kryptonians derive their powers from Earth's yellow sun
Introduction of the concept that Kryptonians are as powerful as ordinary humans under their native planet's red sun
DC Aug 1960

Action Comics #267

Action Comics #267
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$75
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$220
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$825
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3rd appearance of the Legion of Super-Heroes
First meeting of the Legion and Supergirl
1st appearance of Chameleon Boy
1st appearance of Invisible Kid
1st appearance of Colossal Boy
DC Apr 1961

Action Comics #275

Action Comics #275
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$18
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$180
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First mention of Superman's Heat Vision power - previous issues demonstrated his X-Ray vision having powers to melt glaciers
Debut of Red/Green Kryptonite - causes mutations including an extra eye on the back of Superman's head
DC May 1961

Action Comics #276

Action Comics #276
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$400
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1st appearance of Sun Boy, a solar-powered member of the Legion of Super-Heroes
1st appearance of Phantom Girl, a member of the Legion of Super-Heroes who has the ability to phase through objects
1st appearance of Triplicate Girl, a member of the Legion of Super-Heroes who can split into three identical bodies
1st appearance of Bouncing Boy, a density-changing member of the Legion of Super-Heroes
1st appearance of Shrinking Violet, a member of the Legion of Super-Heroes who can shrink to sub-atomic size
1st appearance of Braniac 5, a genius and time-traveling member of the Legion of Super-Heroes
Supergirl joins the Legion of Super-Heroes
DC Apr 1962

Action Comics #289

Action Comics #289
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$45
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$145
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1st appearance of Luma Lunai, an alien woman whose powers would not function under the yellow sun of Earth
In the story where Supergirl attempts to find a wife for Superman, he discloses to here that he would marry her if Earth's laws allowed cousins to be wed - tap cover and swipe to view panel
DC Feb 1964

Action Comics #309

Action Comics #309
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$150
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Appearance of President John F. Kennedy who had been assassinated days before the issue went on sale
The mystery masquerader on the cover is JFK in disguise to help Superman conceal his identity
DC Mar 1964

Action Comics #310

Action Comics #310
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$4
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$12
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$40
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Debut of Jewel Kryptonite
Enhances the mental abilities of criminals trapped inside the Phantom Zone to affect events throughout the universe
DC Sep 1964

Action Comics #315

Action Comics #315
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$8
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$25
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$100
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1st appearance Zigi and Zagi
⚠ Misconception: CGC mislabels Action Comics #316 as the first appearance of Zigi and Zagi

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