Mort Weisinger's reuse of cover images from the Standard pulps, where he had been an editor in the 1940s, has been pointed out often, but I don't know if this one has been. The iconic such swipe is "The Giant Turtle Man" in Jimmy Olsen 52 (June/61), from a Thrilling Wonder Stories cover. Here, from the previous year, is a JO cover (#43, March/60) not using the original pulp cover's design but borrowing a monster design from it. The artist of Startling Stories March 1940 is uncredited. Curt Swan pencilled the JO cover as well as the story, and did the follow-up cover and story in JO 47 (Sep/60) and used the monster as the centerpiece of the cover of 80 Pg. Giant 6 (1965), Superman featuring Fantastic Things and Creatures.