This is Horror Stories for June-July 1937, cover by William F. Soare. The ISFDB entry for this issue is here. The version of the cover presented here is from this French-language collector’s site.
Update April 5, 2017. I mistakenly blogged this image before. If you go to the original post, you can see the image I meant to put up.
This is Terror Tales for January-February 1937, cover by William F. Soare. The IFSDB entry for this issue is here. I found this version of the cover at Trixie’s Treats.
Another pulp recreation by Frans Mensink. I feel a sense of ambiguity about the ape’s motivations here. Is it another menace, or an enraged rescuer?
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This is a crop from a cover of Mystery Novels and Short Stories (November 1939).
The artist is William F. Soare (1896-1940). I wasn’t able to find too much on him, but he does have The Field Guide to American Pulp Artists, whence I found the image above. I originally blogged the image in a post An injection, then…” at Infernal Wonders.
Frans Mensink has a DeviantArt site here and a professional site here.