The link below will take you to a fine documentary about the pulp magazines that were so popular from the 1920's to the 1950's. It is called PULP FICTION: THE GOLDEN AGE OF SCI-FI, FANTASY AND ADVENTURE. Ray Bradbury, of course, began his writing career in the pulps, starting with SUPER SCIENCE STORIES, and later becoming one of finest writers for WEIRD TALES, among many other magazines. Ray is interviewed at several points during the documentary, as is science-fiction writer Frederik Pohl. Before he began his own writing career, Mr. Pohl was a pulp magazine editor and literary agent. And at one point in the film, at around the 14:50 mark, Ray notes that as a young writer seeking an agent, he sent his stories off to a young literary agent named Fred Pohl, who rejected his stories and refused to represent him. To which Fred Pohl replies, "I try to forget about that!" Enjoy!

https://www.youtube.com/watch?v=HzlbRjmWEQ8&t=916s