Tumblr favorite #2128: Ethic of the Assassin

Tumblr favorite #2127: Flight mechanic
Tumblr favorite #2129: Many Ed Valigursky images
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My original tumblr post was here. This cover was first posted by gentlemanlosergentlemanjunkie who identifies it as Planet Stories from July 1953 with cover art by Frank Kelly Freas. The image is sourced to this post at Pulp Covers (“Ethic of the Assassin”) which continues interior illustrations from the issue for extra pulpy goodness.