By the end of the 1930s the field was undergoing its first boom.[1] Fiction House, a major pulp publisher, had run into difficulties during the Depression, but after a relaunch in 1934 found success with detective and romance pulp titles. Fiction House's first title with sf interest was Jungle Stories, which was launched in early 1939; it was not primarily a science fiction magazine, but often featured storylines with marginally science fictional themes, such as survivors from Atlantis. At the end of 1939 Fiction House decided to add an sf magazine to its line up; it was titled Planet Stories, and was published by Love Romances, a subsidiary company that had been created to publish Fiction House's romance titles.