I’ve recused a version of this cover before from the social network I shall no longer name (but rhymes with “bumbler”), but feel okay about doing a reblog now that I’ve tracked it to its source, the October 1942 issue of Thrilling Wonder Stories. The cover is the work of Earle Bergey.” Interestingly, it appears not to illustrate any of the stories promoted on the cover, but “The Molecule Monsters” by Oscar J. Friend (1897-1963).
The interior illustration provides an example of what wartime deprivation could do to the pulps:
This issue of Thrilling Wonder Stories is available to read and download at the Internet Archive.