Weird Tales, January, 1945
Astounding Science Fiction, April, 1943
If someone out there in Internetland is capable of drawing a third silhouette with the T Rex wearing a top hat and twirling a cane, please add the caption “And definitely not this.” and send it my way.
Thrilling Wonder Stories, February, 1942
Back when scientists wore pith helmets.
Wartime America via its magazines.