I think of Walter Popp as more of a paperback cover artist, but here's a pulp cover by him that I like. STARTLING STORIES was a pretty solid science fiction pulp. The best known authors in this issue are L. Sprague de Camp, Joel Townsley Rogers (who had a long, prolific career in the adventure pulps as well as SF), and Roger Dee. Also on hand are R.J. McGregor and Dave Dryfoos, names I don't recognize at all.
Cache (AKA Hidden) (2005)
5 hours ago