Thanks Harry, that's what threw me off. He wrote it in 1947, but I wasn't aware 1967 was the first published date. Actually I don't even know where I got it now that I am researching! It's in my folder with the rest of his stuff, but I promise to check before I post next time.
I caught it right after I posted, but I should have double-checked before posting. Lesson learned. Thanks Harry! See? You inspired me so much, that I was rushing and not thinking...
Ok, so can I at least do the Moon Men then? I already have an idea for the cover...